244: A MAKIJAL OF aMLRICAX LAND SHELLS. 



distinct rows of miuute black dots down the middle, aud other scatter- 

 ing spots on the sides. No perceptible furrow between the mantle and 

 body. They increased very rapidly in size, and in a few days were 

 four times as large as when hatched. 



Of the synonymes I have quoted, Umax togata is said by Gould 

 (Otia, 182) to be identical ; and Umax marmoratus, of DeKay, I have 

 ascertained to be the same from the correspondence of my father with 

 Dr. Newcomb. 



For jaw and lingual dentition see pp. 240, 241. 



The genitalia are figured by Leidy (Terr. Moll., I, Plate III). 

 The testicle lies upon the right side, partly concealed by the liver j it 

 is round and lobulated. The epididymis is tortuous. The vas deferens 

 is A'ery long, tortuous, and muscular. It joins the penis sac at its sum- 

 mit, and has the retractor muscle inserted into it the length of the pe- 

 nis above the latter. The penis sac is irregularly cylindroid, bent at 

 its summit. The ovary is exceedingly lobulated. The oviduct is tor- 

 tuous, wide, and very much sacculated. The prostate gland is longer 

 than in Limax or Avion. The generative bladder is large, globular, or 

 nearly so. Its duct is rather less than half the length of the oviduct. 

 At its junction with the neck of the latter an oval muscular organ exists, 

 the dart sac. Within the latter, at the bottom, is a hemispherical pa- 

 pilla, upon the summit of which is placed a white, calcarate dart. At 

 the junction of the vagina, common to the neck of the oviduct, duct of 

 the generative bladder, and the dart sac, with the penis, there are two 

 short retractor muscles inserted. The cloaca is narrow aud cylindrical, 

 and has surrounding two-thirds of its middle a thick, glandular organ. 

 Interiorly the penis sac, cloaca, &c., have a longitudinal rugose sur- 

 face. 



Tebeiiiiopliortis dorsalis, Binney. 



Color of ux)per surface ashy, with a shade of blue, an interrupted 

 black line < xtending down the center of the back ; eye-peduncles black, 

 Fig. 261. about one-eighth of the length of the body ; tentacles 

 ^^^^^^S' blackish, very short. Body cylindrical and narrow, ter- 

 ^'^"""S"* ''"'■■ filiating posteriorly in an acute point j base of foot 

 white, very narrow, its separation from the body not well defined. 

 Upper surface covered with elongated and slightly prominent glandu- 

 lar projections, the furrows between indistinct. Respiratory orifice 

 yery minute, situtVted on the right side^ about one-eighth of an inch 



