313 



seemingly quite agrees with Lud wig's description of contortus, and 

 I for my part have no doubt in referring it to the same species as 

 the S. American specimens. 



Tœniogyrus keiensis n. sp. 



The Kei Islands, St. 28. 5037'S., 132° 34' E. 17.IV.1922. 400 m. 2 specim. 



The specimens at hand measure ca. 3 cm in length and 0,3 cm 

 in diameter. Their colour is in alcohol yellowish grey. There are 

 10 tentacles each with seven digits. The calcareous ring consists 

 of ten pieces of which the radiais are distinctly notched in the 

 anterior margin (Fig. 67. 2). The muscular impressions are deep 

 and a cartilaginous ring is wanting. There are two large and ten 

 smaller polian vesicles and a single stone-canal. The madreporite 

 is lacking in the one specimen, evidently lost by the rough hand- 

 ling 1 ). In the other specimen it is unusually large (Fig. 67. 1). 

 Whether the large size is really normal it is not possible to decide 

 from a single specimen, but it differs so much from the madre- 

 porite in the other species of Tœniogyrus, that the suggestion lies 

 at hand that it is abnormal. If it will really prove to have the 

 large size, it is not only exceedingly interesting, but it will also 

 be a valid character for separating this species from the other 

 species of the genus. Each of the gonads are branched into three 

 equal branches. The sexes are separate and the genital duct opens 

 on a very little papilla close behind the dorsal tentacles. The intes- 

 tine has a large loop and at the base of the mesenteries there are 

 ciliated funnels. The funnels are usually united into stalked clusters 

 (Fig. 67. 3), but single funnels may also be found. The shape of 

 the funnels is very variable, and they may, as in contortus, some- 

 times be double. 



The calcareous deposits in the skin are wheels and sigmoid 

 bodies. The wheels are of the shape common in this genus, and 

 their diameter is varying from 30- — 120 {ju. The sigmoid bodies 

 (Fig. 67. 5-8) are not arranged into groups. They are quite want- 

 ing on the dorsal side of the specimen, but very abundant on the 

 ventral side. They measure 180 — 220 fi in length. In the ten- 

 tacles there are rather large rods which measure from 210 to 250 fx 



*) It was taken by means of a tangle. 



