GENUS STYLOCHONA. 663 



. elevated in a tongue-like manner, equal in height to nearly one-half of that 

 of the body. Length of the body without the funnel and pedicle 1-500". 

 HAB. Salt water, on Nebalium bipes. 



This species most nearly resembles the brackish-water form Spirochona Scheuteni, 

 from which, however, it may be distinguished, apart from the possession of a pedicle, 

 by the obconical instead of fusiform contour of the body, and by the entire absence 

 of those fibrous or nmbriated processes which ornament one side of the border of 

 the funnel of that type. A large number of zooids of this new species were found 

 attached to the thoracic appendages of the Branchiopodous Crustacean Nebalium 

 bipes collected in St. Clement's Bay, Jersey, in February 1878, having associated 

 with them as messmates or commensals on the same host, examples of the singular 

 Trematode Saccobdella nebalia of Van Beneden, and in one instance also, as presently 

 related, an example of Cothurnia gracilis. Many of the animalcules were under- 

 going a process of gemmation resembling that already observed of Spirochona 

 gemmipara. In examples placed in dilute alcohol the membranous funnel retained 

 its characteristic form, but became unrolled as shown at PI. XXXIII. Fig. 57. 



Stylochona coronata, S. K. PL. XXXIII. FIGS. 54 AND 55. 



Body elongate-fusiform, somewhat gibbous, about three times as long 

 as broad; widest centrally, tapering subequally towards each extremity, 

 mounted on a short, slender, rigid pedicle ; infundibuliform membra- 

 nous expansion largely developed, forming a convolute spire of two 

 coils, the external and basal one equal in width to nearly twice the 

 diameter of the body, its free border fimbriated or fibril late; fibrillae 

 setaceous, of two sizes, collectively approximating the number of fifty, and 

 consisting alternately of one longer and four shorter ones, the inner and 

 apical coil projecting considerably above the basal one, equalling only one- 

 half of the diameter of the latter, its free border not fimbriate ; vestibular 

 fossa much dilated, continued backward into a distinct pharyngeal cleft ; 

 contractile vesicle located close to the vestibulum ; endoplast elongate- 

 ovate, subcentral. Length of body including the infundibulum 1-400". 



HAB. Salt water, attached to the thoracic appendages of Gam- 

 marus sp. 



This very elegant species was obtained by the author attached in some abun- 

 dance to the thoracic limbs of a common shore-frequenting species of Gammarus 

 collected in St. Clement's Bay, Jersey, in the month of March 1:879. It was at first 

 premised that the animalcule was identical with the Spirochona Scheuteni of Stein, 

 previously described, the most substantial evidence in favour of such identity being 

 afforded by the fibrillate ornamentation of the free border of the basal coil of 

 the collar or infundibulum. A closer acquaintance, however, with the structural 

 details revealed the existence of so many important distinctive features that it has 

 been found requisite to confer upon it an independent specific title. In the first 

 instance, the presence of a well-defined rigid pedicle has indicated the necessity 

 of separating it from Spirochona proper, in which an acetabuliform modification 

 of the posterior extremity replaces such an organ of attachment. From Spirochona 

 Scheutcni, which may eventually prove, as indicated in Stein's drawings, to possess a 

 short pedicle, it. is to be distinguished, in addition to the conspicuous development 

 of this last-named organ, by the more attenuate proportions of the body, but most 

 essentially with relation to both the general and more minute structure of the ante- 

 riorly developed membranous funnel or collar. This highly characteristic element 

 in the present form is both far more extensively developed and of more complex 



