SCIENCE-GOSSIP. 



175 



^. 



/•nuicis. 

 sozverbyi. 

 fultoni 

 macron! pJiahis 



I'landa. 

 minor. 



hanlcyi. 



plectostoiiui. 



I. Section Endothyra. 



A. Palatal folds in one series. 



a. Shell 14-15 ni.m. horizontal fold below 

 parietal plate 



b. Shell not ex'ceeding q ni.m. horizontal 

 fold absent 



B. Palatal folds in two series. 



a. Parietal plate without denticles 



b. Parietal plate with one denticle pos- 

 teriorly 



c. Parietal plate with two denticles posteriorly 



(X. Shell not exceeding- 6 m.m. 



* One upper and one basal palatal fold, 

 t A short horizontal fold above 

 parietal plate . . 

 tt horizontal fold none 



* * Only one basal palatal fold 

 shell 8-10 m.m. 



* Parietal plate gives oft' anteriorlx- a 

 horizontal fold from upper extremity ; 

 one short horizontal fold below 



* * No horizontal foldproceeding-froni 

 parietal plate ; two short horizontal 



folds below.. .. .. .. . nffinis. 



II. Section Chersaecia. 

 I. Dextral. 



A. Transverse parietal plate simple. 



a. Free horizontal parietal folds none. 

 a. Palatal folds six. 



Connected by a transverse ridge ; 

 shell 27 m.m. .. .. oglii. 



** Not connected ; shell 24-26 m.m. . nndcrsoni. 

 ). Palatal folds7?r'(>; shell 11 m.m. .. serica. 

 "y. Palatal folds .wt'ch with two denticles lao)iiontami. 



b. A tree interrupted horizontal fold in 

 front of parietal plate; palatal folds si.x, 

 four inner united by a vertical ridge, 



seven denticles posteriorly . . . . an.stetii. 



B. Transverse parietal plate- giving oft 

 anteriorly above a short horizontal fold, with 

 a denticle below plate. Palatal folds six; 



shell lo-ii m.m. .. .. .. .. miiui/iuroisis. 



C. Transverse p2rietal plate giving oft' 

 anteriorily bf/av a long horizontal fold. 



a. With a median horizontal fold con- 



timious to the peristome ; shell 20 m.m. . . bracltydiscus. 



b. With a median horizontal fold /«- 

 tcrrvpted; shell 16 m.m. .. .. .. dextrorsa. 



/3. 



2. SiMSTRAT.. 



Parietal plate simple. 

 a. Horizontal fold 

 parietal plate, short. 

 0,. No median fold . 



below transverse 



/3. 



5. A long- median fold present. 

 ~' A third short horizontal told be- 

 tween upper and lower parietal folds. 



+ Palatal folds, all horizontal, shell 



10 m.m. . . 



tt Palatal folds, one \ertical, rest 



horizontal ; shell 7.5 m.i-n. . 

 ** No third fold present 



b. Horizontal fold below transverse parie- 

 tal plate long-, joined to apertural ridge 



c. Three short horizontal folds in front 

 of transverse parietal plate, none below it 



B. Transverse parietal plate giving oft' 

 anteriorly below a short horizontal fold ; a 

 long median and a long lower fold present, 

 joined to apertural ridge. 



a. Palatal folds : all horizontal 



b. Palatal folds : one oblique, rest hori- 

 zontal. 



musp7-atti. 



pcrarcta. 



shii-oiensis. 

 nagnensis . 



perricrac. 



re/itga. 



shanensis. 



CI. Parietal plate rounded in outline . . Uiophis. 



p. Parietal plate /()oi'/;(-^/ in outline .. pseudophis. 

 C. Transverse parietal plate giving oft' an- 

 teriorily below a short horizontal fold, two 

 short free horizontal folds above the latter, 

 and a long one below joining the apertural 

 ridg-e brahiun. 



III. Section Exnopi.ON. 



A. Shell flattened. 



a. Armature unknown phlyaria. 



b. T«o vertical parietal plates . . . . bracliyplecta. 



c. One %ertical parietal plate with two 

 denticles in front sinithiana. 



B. Shell with more or less conical spire. 



a. One transverse parietal plate. 



O. One denticle in front of parietal plate. 

 Parietal plate rciunded in outline ; 

 shell not exceeding 26ni.m. . . scJduiiibergeri 



Parietal plate toothed in outline ; 

 shell, 30 m.m. . . . . jo7<ia. 



fj. Two denticles in front of parietal 



plate villedaryi. 



b. Two transverse parietal plates. 

 U. One horizontal parietal fold. 



'■' above anterior plate . . . . . . giardi. 



' ^' below both plates . . . . . . congestn. 



p. Two horizontal parietal folds, one 

 above, one below, the latter joined to 

 the two transverse plates . . .. .. /ran^oisi. 



l\. Section Pi.ectopyi.is, s.s. 



A. Two transverse parietal plates. 



a. Parietal plates parallel ; upper hori- 

 zontal palatal fold bisected. Shell less 

 thano m.m. 



U. Median parietal told truncate, not 

 joined to apertural ridge . 



|0. Median parietal fold not truncate, 

 joined to apertural ridge . . 



b. Parietal plates divergent ; upper hori- 

 zontal falatal fold not bisected. Shell 

 mc re than 20 m.m. 



c. Anterior parietal plate giving off a long 

 horizontal fold above, and 



0.. A short one below, half the length ot 

 upper ; palatal folds in two series 



Kj. Lower fold one-quarter of the length 

 of upper ; palatal folds in one series 



B. Three trans\-erse parietal plates.. 



C. Parietal plate ramified. 



a. Shell acutelj' keeled. Parietal fold tri- 

 furcate : a short horizontal fold near 

 aperture . . 



b. Shell not keeled. Parietal fold tri- 

 furcate. 



(X. No horizontal fold below parietal 

 plate, a free interrupted horizontal fold 

 in tront 



p. Parietal fold gi\ ing off anteriorly an 

 interrupted horizontal fold ; a short 

 horizontal fold below plate 



v. Parietal fold giving oft" anteriorly a 

 continuous fold 



« Shell thin 



** Shell thick. 

 + Upper arm of parietal fold 

 longest, lower horizontal fold united 

 to apertural ridge 



tt Lower arm longest, lc>wer hori- 

 zontal fcild not united to apertural 

 ridge. 



\ Whorls much flattened, umbili- 

 cus very shallow 



(SJ Whorls less flattened, umbilicus 

 deeper . . . . 



ponsonhyi. 

 lissocldaiitys. 



ivoodthorpez 



lemochila. 

 feddcni. 



cyclnspis. 



I interne. 



karenoruln. 



repi'reiis.^a. 



nngiiina. 

 acltatina. 



