24 AKT. 4. — I. IK EDA : 



PHYMOSOMA ANTILLARUM, Grübe and Oersted. 

 Selenka, (28), 1883, p. 57. 



From Selenka's description the specific characters of this 

 species may be summed up as follows : 



Length of body-proper 3 cm.-, length of introvert 18 mm. 

 Skin yellow, thick, covered with low blackish brown papillœ. On 

 the introvert, the papillae are of a tall conical form, sparsely 

 distributed. Around the basis of filiform tentacles, of which there 

 are 50-80, there is present a collar-like skin-fold. Two eye-spots 

 on the ganglion. 



Longitudinal muscles of the body-wall are divided into bundles, 

 which very frequently anastomose with one another. Intestinal 

 convolution consists of about 20 spirals. Rectal intestine long. 

 Spindle muscle is fixed to the body- wall at both ends. A single 

 fixing muscle joins the first intestinal spiral. Dorsal vessel carries 

 very numerous, finger-shaped contractile villi. Segmental organs 

 are about half as long as the body proper, their entire course 

 being accompanied by a mesentery. 



Five specimens of this species were collected on the Islands 

 of Amani-Oshima (Koniya) and of Okinawashima (Naha, Itoman, 

 Chinensaki). The general external features as well as the ana- 

 tomical characters agree well with Keferstein's original descrip- 

 tion of this species. The Japanese specimens however are much 

 smaller than those collected in the West Indies (St. Thomas L). 

 Of the former the largest in my possession does not exceed in 



