. REPORT ON THE SIPHONOPHOE.E. 337 



Tentacles. — The single tentacle which arises from the base of each siphon is a long 

 cylindrical tube, in the fully expanded state 80 to 120 mm. long or more. It is beset 

 with a series of very numerous tentilla or lateral branches. These are simple, cylindrical 

 filaments, of the same shape as in Nectophysa wyvillei (PI. XXIII. figs. 5, 6). The 

 concave ventral side of the tentilla bears sensible papillae, the convex dorsal side is 

 armed with spherical cnidocysts. 



Patyons. — The corona of tasters, which occupies the uppermost part of the sipho- 

 some, immediately beyond the float of the nectosome, is very similar to that of the 

 Discolabidae {Physophora). The palpons (q) are slender, very movable, cylindrical tubes 

 with a thick muscular wall. Their cavity opens at the proximal end into the vesicular 

 trunk, whilst the closed distal end is armed with cnidocysts and a purple ocellus. Their 

 function is not only sensory, but also protective and capturing, as in the Discolabidae. 



Gonodendra. — Each cormidium is monoclinic and bears a very large gonodendron, 

 attached by a short pedicle to the periphery of the vesicular trunk, between the superior 

 palpons and the inferior siphon. The gonostyle is richly branched, and each ultimate 

 branch, similar to that of the Salacidae (PL XXV. figs. 6, 7), bears a large, distal, 

 medusiform gynophore and a bunch of club-shaped androphores with small gonopalpons 

 scattered between them. 



Epibulia ritteriana, observed in the living state, with its vivacious movements, 

 belongs to the most beautiful and elegant forms of Siphonophorse ; at the same 

 time it is of a peculiar morphological and phylogenetic interest. I dedicate, therefore, 

 this splendid Indian form to my honoured friend, Dr. Paul von Patter of Basel, the 

 magnanimous founder of the " Paul von Ritter'sche Stiftung fur phylogenotische 

 Zoologie an der Universitat Jena." 



Genus 73b. Angela? Lesson, 1843. 

 Angela, Lesson, Acaliphes, p. 496. 



Definition. — Epibulicke with trifid tentilla, each lateral branch of the tentacles being 

 divided at the distal end into a terminal ampulla and two lateral horns. 



The genus Angela was established by Lesson (Joe. cit., p. 496, pi. ix. fig. 1) for 

 a Siphonophore, a figure of which, drawn from life, had been given to him by 

 Rang, without description. Comparing this figure with our Epibulia (PI. XXII. fig. 6), 

 I suppose that Angela cyiherea (from the Tropical Atlantic ?) may have been a true 

 Epibulid. The base of the large, depressed, spheroidal pneumatophore is surrounded by 

 a corona of numerous palpons, and inside of it depend eight very long tentacles, 

 provided with a series of numerous tentilla. Each tentillum is divided into three 



1 Angela, a female angel. 

 (ZOOL. CHALL. EXP — PART LXXVII. — 1888.) Hhhli 43 



