286 



H. M. WOODCOCK. 



anterior flagellum is longer than tlie free portion of tlie 

 posterior one. The species included are not, so far as is 

 known, hasmal parasites. 



T. grobbeni (Pocbe), 1903. Average length 60 — 65/^; width about 4^. 

 The undulating-membrane is relatively narrow and not expanded into wider 

 folds at intervals (fig. 41). The anterior flagellum is fairly long, but the 

 free part of the posterior one is short. This species is parasitic in 

 certain Siphonophora, Cucubalus kochii, Halistemma tergest- 

 inum, Monophyes gracilis, of common occurrence in the Gulf of 

 Trieste. Apparently the same parasite has also been observed in Abyla 



Fig. 41. — Trypanophis grobbeni (Poche). e.c, ectoplasmic 

 cap; e.l., delicate ectoplasmic layer, thinning out posteriorly ; m., 

 undulating-membrane ; i„ inclusions in the cytoplasm ; x., nuclear 

 body of uncertain origin and significance. (After Keysselitz.j 



pentagona, from the Gulf of Naples. The organisms are to be met with 

 in all the ramifications of the ccelenteron, from the digestive cavity of the 

 gastrozoids to the radial canals of the medusoid buds. 



Nothing is known regarding the transmission of the parasite from one 

 Siphonophoran colony to another. That is to say, we are quite in the dark 

 as to whether they have any alternate host or not. Of the two suppositions, 

 the latter seems much the more probable. 



T. (Trypanoplasma) intestinalis (Lcger), 1905. A much .smaller 

 form than the last (fig. 40). The dimensions given are : Length of body 

 (without "tail") 14/t; of anterior flagellum, IG ^ [judging from the 



