ACTixoroDOrs hülothueioidea. 19 



Description : — Dorsal surface was mottled with irregular, largo 

 and small, reddish-browu patches ; the largest patch not more than 

 5 mm. across. But as some of the patches were close together, the 

 whole dorsal surface appeared variegated witli reddish-brown areas 

 on lighter ground. The ventral face was uniformly reddish-brown. 

 Prof. Ijbia marked specimen No. 10G7 at the time of capture 

 " Transparent with crimson markings or patches." Ilis specimen 

 being smaller and therefore younger, the perisome was probably 

 more transparent, and tlie marking perhaps brighter. These 

 markings entirely disappear in alcohol, and the entire animal 

 becomes translucent and whitish. 



Tentacles 20. Dorsal papillae in six rows corresponding to 

 those in >S. triradiata. Tlieir shape is also tlie same as that of the 

 papihae in >S. tr/.radiata, viz., each with a broad wart-like base and 

 a slender distal part. Their length seems to bo uniform, i.e., there 

 is no tendency of the slender distal part to grow longer in those 

 papillae placed on the dorsal side of the mouth — a character 

 somewhat mrirked in S. triradiata. In the smallest specimen 

 (Xo. 1007), dorsal papillae are much sliorter than in S. triradiata, 

 but are still in six rows. Ventral pedicels in three zones. 

 The two lateral zones with pedicels arranged in two 

 alternate rows ; the median zone with same in longi- 

 tudinal iialves, each half witli 2 — 3 alternate rows. The 

 clear space between the zones wider than in S. triradiata. 

 Genital tubes in two bundles. Polian vesicle single, about 

 1.5 cm. long in larger specimen. Stone-canal single, at- 

 tached to the mesentery, wliich runs in front of, and i)arallel with, 

 the genital duct and becomes attached to the body-wall. An- 

 terior processes of the radialia uf the calcareous ring usually 

 wide. 



