178 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



W. G. BiNNEY, T, M., IV. 161, PI. LXXIX. Fig. 33 ; L. & Fr.-W. Sh., I. 24, 

 Fig. 19 (1869). 

 Holospira Gold/ussi, Tryon, Amer. Journ. Conch., III. PI. XV. Fig. 31 

 (1869). 



Texas, on the Blanco ; a species of the Texas Subregion. 



In the penultimate whorl of Goldfussi there are 4 lamellae : one strongly de- 

 veloped, situated on the under side of the upper septum, and in length about 

 equal to one half of the circumference of the whorl; another on the upper sur- 

 face of the lower septum, immediately beneath and opposite to the above-men- 

 tioned lamella, and of about equal length, but not so much developed ; a third 

 lamella on the middle of the lower half of, and revolving on, the axis; the 

 fourth on the inner side of the outer wall of the shell (opposite the axial 

 lamella), and visible from the exterior. 



For lingual membrane and jaw, see p. 176. 



ONCHIDELLA, Gray. 



Animal llmaciform ; body oblong or oval ; mantle covering the whole body 

 and reflected under the body, smooth or granular, without tufts or radiating 



processes on the dorsal surface ; foot 

 ^" * broad, simple posteriorly ; oral append- 



ages lobate, simple, undivided ; tentacles 

 none ; eyes at the end of long, club- 

 shaped retractile peduncles. Respira- 

 tory orifice posterior, at the right side. 

 Anal orifice separate, posterior ; male 

 organ under the right eye-peduncle, fe- 

 o borealis. male orifice at the posterior extremity of 



the body. No caudal mucus pore. No 

 distinct locomotive disk, though the reflection of the mantle on either side 

 of the foot gives a tripartite appearance to the under surface of the body. 

 Shell none. 



In three specimens of 0. borealis examined I found a jaw (Fig. 88), 

 low, wide, slightly arcuate, ends scarcely attenuated, blunt, anterior surface 

 ribless. 



Lingual membrane (PI. V. Fig. B) long and wide. Teeth about 61 — 1 — 61, 



^'g- ^ ^ arranged strongly en chevron. The central tooth is large, 



^^^^■^^^^ longer than wide, truncated above, expanded below its mid- 



^^ die, and incurved at the basal margin. The reflection is 



Jaw of O. borealis. .... 



large, tricuspid, each cusp bearing a decided cutting point. 

 The side teeth have a long, narrow base of attachment, a small part of its 

 upper portion thrown outwards, the balance curving inwards, giving an irregu- 

 lar bow-shape to the whole base of attachment, — whose upper and lower edges 

 are abruptly truncated. The reflection is near the base, and consists of a very 



