35 193 



The salivary glands have in both genera kept the same place, and, according to 

 the above interpretation, they should in the Doriopsis as usual open in the hinder end of 

 the bulbus pharyngeus, in the Doriopsillae at the base of the pharyngeal cone. 



Of this genus only one species, the D. areolata, from the Adriatic Sea and the 

 eastern part of the Atlantic Ocean (the northwestern coast of Spain), has hitherto been 

 known. To this is now to be added another species, D. pallida, from the Indian Ocean 

 (the Siamese Sea). If the Doriopsis granulosa of Pease (Proc. zool. soc. London. XXVIII. 

 1860. p. 32) from the neighbourhood of the Sandwich Islands really belongs to the Doriop- 

 sididae, it is likely also to be a Doriopsilla. 



Doriopsilla pallida, Bgh., n. sp. 



One little specimen of this form was found between Koh Mesan and Cape Liant 

 on a large Alcyonid, which was taken on March 7 th , 1900, at a depth of 5 — 8 fathoms. 



The specimen which was kept in spirit, showed the rather stiff back to be whitish 

 with slightly grayish , small prominences ; the rhinophores and the gill-leaves were some- 

 what darker gray, the foot was grayish. In the middle of the back the liver shone through 

 with a dark gray colour. — The form was short-oval, the length was 6 mm , by a breadth 

 of 5 mm , and a height of 3 mm . 



The back proper was framed all round by the stiff, rather thin mantle brim which 

 had a breadth all round of l - 5 mm ; the back was everywhere covered with truncate conical, 

 slightly grayish , not stiff tufts ; on the upper , as well as on the smooth lower surface of 

 the mantle brim series of spicules were seen shining through, more or less perpendicular 

 on the edge. The rhinophores were small, conical; the contracted, roundish gill-slit was 

 surrounded by somewhat larger tufts; the number of gill-leaves seemed to be four. The 

 head formed only a small papilla, as it would seem, without tentacles. The sides of 

 the body had almost disappeared, the genital papilla was as usual. The foot was rather 

 strong, anteriorly rounded; it was also rounded posteriorly, but here somewhat tapering; 

 the tail was quite short. 



The central nervous system was as in other Doriopsididae, only the buccal 

 ganglia — one of the chief characters of the Doriopsillae — were situated anteriorly. — 

 The short-stalked eyes had a diameter of 0'16 mm ; they had a large, slightly yellow lens 

 and a large black pigmental capsule. The otocysts had a diameter of 0-06 mm , and were 

 closely filled with otoconia of the common kind. Everywhere in the skin was found a 

 great many long spicules, most of which were not much calcified; they had a diameter of 

 0-013— 0-016 (0-020) mm ; such spicules were also found (up lo 0-2 mm high) in the tufts of 

 the back. Similar spicules were also everywhere mingled in the interstitial connective 

 substance. 



D. E. D. Vidensk. Selsk. Skr., 6. Række, naturvidensk. og mathem. Afd. XII. 2. 25 



