THE NAUTILUS. 59 



those of the species of Cochlostyla. It appears to be nocturnal, 

 and is very inactive. Never once has it been seen stretched at 

 full length. The animal is a remarkable creature. The mantle 

 is whitish, and the lung is extremely capacious, with a wide 

 orifice. The foot above is white, with a large caudal mucus 

 gland. Anterior three-fifths of sole pale brownish-grey, the 

 posterior two-fifths dull white, contrasting. Head blackish; 

 oculiferous tentacles blackish, stout basally, eye-bulb pale 

 ochreous; lower tentacles white at end, with the bulb pale 

 ochreous. The shell has a diameter of about 75 mm. 



Cochlostyla rufogastra Less. 



Kindly determined by Dr. Bartsch, who states that it belongs 

 to the typical subspecies. In both the species of Cochlostyla the 

 foot is emarginate anteriorly, but in other respects the animals 

 of the two present marked differences. C. rufogastra has the 

 mantle black; and the very broad sole plumbeous in the middle, 

 with the lateral areas (not so wide as the middle one) black; 

 the extreme edge of the sole is narrowly reddish. The body 

 above and on the sides is reddish-brown, with the conspicuous 

 ruga? darker ; the dorsum is strongly blackened. The eye- 

 bearing tentacles are very long. A couple of these snails mated, 

 and later one laid a great quantity of eggs, which, however, did 

 not develop. The eggs are spherical, soft, opaque white, with 

 a diameter of 7 mm. 



Cochlostyla metaformis F6r. 



A much smaller species than the last, with a pale-colored 

 shell. There are two varieties, one banded, the other bandless ; 

 the soft parts are the same in both. The species was identified 

 by comparison with a specimen determined by Dr. Bartsch. 

 The oculiferous tentacles are very long, 24 mm. ; head rather 

 elongated, lower tentacles about 5 mm. from base of eye-bearing 

 ones. Body anteriorly pale greyish-brown, tentacles reddish; 

 posteriorly the body is pale grey dorsally, the sides of the foot 

 washed with ochreous; mantle light reddish ochreous. The 

 sole is light ochreous, without longitudinal zones differentiated 

 by color, but the margin is suffusedly a little darker. Both 

 species of Cochlostyla are quite active by daylight. 



