376 CARL VOGT. 



The genus Loxosoma majrbe thus characterised : — 



Poh/pides solitary/, attached to a contractile stem ; tentacular 

 crown on the ventral side of the hody ; I)nds produced on thehody. 



The Author recognises the following species, which he ranges 

 in two groups : 



Species with a pedal gland — 



I. Loxosoma Neapolitanum, Kowalewsky. 



II. L. raja, cochlear, and siMg^dare, Oscar Schmidt, which 

 are probably only different states of one and the same species. 



Species without a pedal gland — 



III. L. Kefersteini, Claparede. With numerous buds. 



IV. L. singidare, Keferstein. Stem terminating in a circular 

 disc. Buds never exceeding two in number. 



V. L. phascolosotnatum, C. Vogt. Stem pointed below like 

 the nib of a pen. Never more than two buds.^ 



cellina, and probably in Loxosoma, the larva attains a form which approaches 

 very near to that of the adult animal ; its internal organisation is conformed 

 to the type of the adult, and a few comparatively unimportant changes 

 suffice to transform it into the polypide. Its structure determines that of 

 the polypide. Its large contractile mantle, continuous with the body-wall, 

 and enclosing (he whole anterior extremity of the body, forms the sac-like or 

 hood-like vestibule of the polypide, into which both orifices of the digestive 

 canal almost of necessity open. Within the border of this mantle (or 

 extension of the body-wall) the tentacles are developed, and of course 

 surround both apertures. In this position they are necessarily non-retrac- 

 tile, and their movements, which are very limited, depend on those of the 

 sac to which they are attached. 



These peculiarities in the developmental history and the modification of 

 the structure of the polypide which they involve are, so far as we know 

 at present, confined to the Entojirocta. They (and not the mere position 

 of the anal orifice, as Vogt contends,) separate this group broadly from the 

 rest of the Polyzoa, and abundantly justify us in regarding it as a distinct 

 sub-class. — Transl. 



1 As I have mentioned, one or two new species have occurred to me, and 

 now that attention is directed to the tribe we may expect that many more 

 will be discovered upon the annelids, to which the Loxosomas principally 

 attach themselves. — Transl. 



