1899.] NATURAL SCIENCES OF PHILADELPHIA. 513 



where it is bifid and covers a lai'ge branchial pkime, which does 

 not come out between the lobes and is not visible from the upper 

 surface. No tentacles. Foot wide; sides recurved and extended 

 into small epipodia. Color rather bright green, changing to fawn 

 color at the edges; foot and branchial plume dark green. On 

 the anterior shield is a vivid black pattern like a large figure of 8, 

 on the posterior shield a somewhat similar pattern, but the lower 

 circle of the 8 is not complete. The edges ^ of the epipodia are 

 irregularly marked in black and there are five black spots on the 

 foot. An alcoholic specimen measures 33 ram. long. 



I obtained a single specimen of this animal under seaweed on 

 the Ajiia reef. In captivity it was very sluggish in its movements. 



I have been unable to find any description corresponding to this 

 species, which is clearly distinguished from other Doridia by its 

 coloration and markings. Should I be right in supposing it to be 

 new, I propose to call it Doridium (^Aglaia) Pilshryi. 

 Aplysia (Tethys) nigrocincta Martens. 



I captured three specimens at Apia July 19, which seem ref- 

 erable to this species, though it is not very fully described, and 

 recorded from Mauritius. 



The animals are about an inch and a half long, but are apt to 

 contract themselves into a ball, in which condition they become 

 much smaller. The color is light brown, with multitudes of 

 minute white spots, some of which are arranged in clusters so that 

 they appear like one large gray spot. The edges of the foot, man- 

 tle opening, rhiuophores, tentacles and siphon are marked with a 

 fine but very distinct black border. The epipodia are ample but 

 thin, united behind the large siphon, but widely separate in front. 

 The mantle opening is very large and displays the shell, which is 

 large, convex and white, not yellow, as stated in the descriptions 

 of Aplysia nigrocincta. 



The whole animal reminds one of Aplysia parva, which I have 

 seen alive at Key West. 

 Aplysia (Tethys) Benedict!, n. sp. PL XIX, figs. 2a, 26. 



From July 19 to 21, I caught sevei'al examples of a species of 

 Aplysia, which was abundant in Apia harbor during this period, 

 on shallow sandy spots, and then vanished as suddenly as it had 

 appeared. 

 33 



