NO. 1285. FA UNA OF MAMMOTH CA VE—HA Y. 227 



or Iw gentl}' slipping' iny hand beneath them as they swam slowly on 

 the surface; in fact, the latter method Avas' used in nearly every case. 

 Twelve specimens were put with a live e3^eless fish into a 8-ounce 

 bottle, tightly corked, and without a change of water carried al)out in 

 the cave for over four hours; on reaching the hotel most of them 

 were still alive, and the few that were dead seemed to have been killed 

 by the slime from the fish. Five of them lived for over two da3's in 

 a tumbler of water on the table in ni}^ room, Avhere the temperature 

 stood at times as high as 85 degrees. 



On reaching Washington a specimen was at once stained, dissected, 

 and mounted, and I found that my shrimp was not onl}^ a new species 

 but must stand as a representative of a new genus, to which the name 

 Palxmonias was given, ^ with the specific name of ganteri in honor of 

 the manager of the cave, Mr. H. C. Ganter, who aft'orded me the 

 facilities for making- my collection. 



As the description mentioned was quite brief and unaccompanied by 

 figures and regarded as only a preliminary notice, it seems advisable to 

 introduce here a more detailed account of the characters of this some- 

 what remarkable species. 



The carapace is veiy thin, delicate, and transparent, in form cylin- 

 drical or slightly compressed; the greatest depth is near the posterior 

 end; the anterior border, below the eye, is produced into two spini- 

 form points, the upper of .which is the larger; the rostrum is slender 

 and slighth" wider near the middle than at the base, the lower margin 

 bears from one to three minute teeth, while on the upper margin there 

 are about thirteen, of which the first two or three are at the veiy base, 

 almost on the carapace, and are separated bj quite an interval from a 

 group of eight or nine near the middle of the rostrum, which in turn 

 are separated by a second small interval from the group near the distal 

 extremit3\ 



TheaV)domen is compressed, rounded above, and exceeds the cephalo- 

 thorax in length. The sixth segment is as long as the fourth and fifth 

 coml)ined. The swimmeretts of the first segments are large and thickly 

 fringed with setffi. 



U'roc. Biol. Soc. Washington, XIV, pp. 179-180, Sept. 25, 1901. 



PAL^^MONIAS, new genus. 



Similar to PaUemoneten in fonn and in the absence of a mandibular palpus. Ciills 

 four and a rudiment on each side. Rostrum long, slender, and serrate above and 

 below. Antero-lateral margin of carapace with two spines. First two pairs of 

 ambulatory appendages subequal in size and similar in form, chelate and with large 

 bunches of pectinate bristles on tlie tips of the fingers.' The articulation of the hand 

 with the carpal segment is at a point on the lower surface of the hand some dis- 

 tance from the proximal end, and the prominent knob-like extremity fits when the 

 limt) is fully extended, into a broad sinus formed by the margin of a plate-like 

 expansion of the carpus. 



