332 BULLETIN OF THE 



mesial line from head to prominence; eye-peduncles very short, cylindrical, 

 retractile, and of a dark neutral color ; tentacles similar, but shorter and lighter 

 in hue ; below these last are a small subpellucid pair of false tentacles, a pro- 

 longation of the sole of the foot ; below, the foot is dull opaque white with a 

 tallowy yellow tint and with an indistinct bluish streak along middle. 



One specimen under a stone in a wood, Ungeni Valley, Natal Colony. 



When the mollusk wishes to rest it withdraws its head completely, brings 

 together the two margins of the foot, and then doubles under the tail end. 



The above is Mr. Gibbons's description. In my generic description it will 

 be seen that there is no jaw. The lingual membrane is long and broad, con- 

 sisting of about 52 chevron-shaped rows of 27-1-27 teeth, all as in Glandina, 

 the central one differing only in being smaller than the adjacent marginals, and 

 symmetrical, with a long, slender cutting point : there are no laterals, all the 

 side teeth being purely aculeate marginals and first rapidlj^ increasing and then 

 gfradually decreasing in size as they pass off laterally, as is usual in Glandina 

 (PI. II. Fig. B). Buccal mass very large indeed. 



The internal shelly plate is quite thick ; it was in several pieces when found 

 by me, but I doubt not its being in a single subhexagonal plate when perfect. 

 It is 3 mill. long. 



I regret that the dried condition of the single specimen received prevented 

 my examining the character of the tentacles and the internal anatomy, espe- 

 cially to learn if the sexual organs be separated, as in Veronicclla and Vaginulus. 



Onchidella Carpenter!, W. G. Binn. 



Gulf of California. :\Ir. R. E. C. Stearns. 



There is no jaw, which fact renders still more doubtful the presence of one 

 in Onchidella borealis as published by me in Terr. Moll. U. S., V. 178. 



The lingual dentition is of the same type as that of O. horealis (1. c). The 

 upper margin of the base of attachment is still more prolonged in O. Carpenteri. 



Zonites Whitneyi, Newcomb. 



On p. 432 of Terr. ]\Ioll. of United States, VoL V., will be found a descrip- 

 tion of the dentition of this species, Avhich is figured here (PI. I. Fig. 1) by 

 showing a central with its adjacent lateral and one marginal tooth. 



Zonites subplanus, Binnet. 



At the same locality where Miss Law found Vitrinizonifes latixsimus (q. v.) 

 she found several specimens of Zonifc.i siihplanux, a dark, almost black variety. 

 As would be anticipated, tlie species has the same dentition as Zonites inor- 

 natns, to which it is nearly allied. 



Janulus staph anophora, Desh, 



Madeira. Dr. Ilillebrand to Dr. Newcomb. 



Jaw strongly arcliod, ends pointed, cutting margin with a sharp, greatly pro- 

 duced median projection. 



Lingual membrane not observed. 



