THE THALIACEA. 



91) 



ii. THE HEMIMYARIA. 



This group presented no features of great interest, unless the scarcity of its repre- 

 sentatives be reckoned as such. So far as the captures go, they confirm the conclusion 

 of Apsteiu * that Salp(B do not extend deeper than about 218 fathoms (400 metres), as 

 the lowest haul with the closing-net which contained Salpce was 35 o, 250-150 fathoms. 

 At no hoi'izon were they plentiful ; only 29 specimens were distributed over 15 hauls. 



The occurrences sre noted in the General Table (pp. 100-101). 



The species captured were : — 





;,^ 



Salpa runcinata-fusifoemis, Cham. Cuv. 



Of these there were eight gregatte, one solitaria. 



Salpa echinata, Herdman (?fusiformis, var. echinata, Apstein). 



Two specimens were taken, by which the distribution of the species is considerably 

 extended northw^ard. 



Salpa democratica-mucronata ?, Forskal. 



Eighteen badly damaged specimens were perhaps referable to the gregala form of this 

 species. * 



In the following General Table of Distribution the first three hauls are those made 

 with the closins-trawl. 



The letters have the following significance :— 



13 = Blastozooid. 

 G = Gonozooid. 

 Gr = Gresata. 



P = Phorozooid. 

 So = Solitaria. 

 T = Trophozooid. 



* C. Apstein : ' Die Thaliacea der Plankton-Expedition, — B, Verthcilung der Salpen; p. 49. 



