160 ANNALS OF SCOTTISH NATURAL HISTORY 



Family SERTULARID^. 

 PARASCYPHUS, gen. nov. 



As I have found it necessary to found a new genus for 

 the following species, I give here a short diagnosis of the genus. 



Trophosome. Trophosome Campanularian in aspect, consisting 

 of a hydrocaulus, divided into a series of internodes, each bearing 

 a hydrotheca. Hydrothecse subcylindrical, pedunculate, having an 

 emarginate rim furnished with an operculum consisting of a few 

 definite valves ; the cavity of the hydrotheca separated from that of 

 the peduncle by an imperfect diaphragm. Hydranth bilaterally 

 symmetrical, of Sertularian type, with blind-sac, retractor and pro- 

 tractor muscles, and a wide hypostome surrounded by a whorl of 

 filiform tentacles. 



Gonosome. Unknown. 



The discovery of the Sertularian nature of the hydranth places 

 this genus in the family Sertularidas. 



The following is the only species known : 



44. PARASCYPHUS SIMPLEX (Lamouroux). 



Laomedea simplex, Lamouroux, " Hist, polyp, corral. Zoophytes," 

 1816, p. 206. 



Campanularia tridentata, Bale, " Proc. Roy. Soc. Victoria" 

 (n.s.), vol. vi., 1894, p. 98, pi. iii. fig. 3. 



Sertularella tridentata, Hartlaub, " Abh. Ver. Hamburg," vol. 

 xvi., 1900, p. 46, fig. 21. 



Thyroscyphus tridentatus, Hartlaub, " Zool. Jahrb. Syst." vol. 

 xiv., 1901, p. 369, pi. xxi. fig. 14, pi. xxii. fig. 23. Idem, Ritchie, 

 "Trans. Roy. Soc. Edinburgh," vol. xlvii., 1909, p. 75, fig. i, a, b. 



Thyroscyphus simplex, Billard, " C. R. Acad. des Sc." vol. 

 cxlviii., 1907, p. 1065. Idem, Billard, "Ann. Sc. Nat. Zool." 

 (n.s.), vcl. ix., 1909, p. 312. 



The following short description of the specimen before me will 

 serve to indicate the characters of this species, which has not 

 hitherto been recorded from the North Atlantic : 



Trophosome. The two stems are short (the longest 8 mm. 

 high) and unbranched, springing from a stolon which itself appears 

 to be the continuation of a stem. The stem is divided into regular 

 internodes, between which are slanting nodes, often, however, very 

 indistinct. On each internode is borne a hydrotheca which 

 alternates with its predecessor and successor, and lies in the same 

 plane with them. A hydrotheca rests upon a short process at the 

 distal end of an internode, and is marked off from this process by a 

 distinct boundary line. Occasionally one or more joints appear to 

 be inserted between the hydrotheca and the stem-process ; but these, 

 as I have already shown (1909, p. 75, fig. i, b}, are not normal but 



