GENUS SPIROCHONA. 66 1 



simple Hj'potrichous t)^e as Chlamydodon, and at the same time also the ciliated 

 embryos oi Hemiophrya gemmipara, Dendrocometes paradoxus, and other Acinetidae. 



Spirochona Scheutenii, Stein. Pl. XXXIII. Figs. 50-52. 



Body elongate, subfusiform, narrowed posteriorly ; organ of attachment 

 apparently agreeing with that of S. geminipara, but this not yet definitely 

 ascertained ; peristome produced as a wide, funnel-like, spiral lamina, 

 having only a single horizontal turn, and bearing on one side numerous 

 fimbriated processes. Length of body 1-300". 



Hab. — Salt or brackish water, attached to Gammarus mar inns and 

 other Entomostraca. 



Further investigation will probably demonstrate that this species, in common 

 with the preceding form, is adherent to its basis of support through the medium of 

 a sucker-like expansion of its posterior extremity, instead of by a short pedicle, as 

 described by Stein. A closely corresponding, but even more strongly marked, 

 fimbriated ornamentation of the border of the infundibulum, occurs in the type 

 hereinafter described under the title of Siylochona coronata. There can be but little 

 doubt that the so-called Vaginicola figured by Messrs. Bates and Westwood,* repro- 

 duced at PI. XXXII. Figs. 51 and 52, found attached to the natatory appendages of 

 Gamtnarus marinus, is synonymous with this type. An identical or closely allied 

 species has likewise, they record, been reported by Mr. Rentsch as occurring on 

 Gammarus ornatus. According to the figures given by the two first-named authorities, 

 the species is attached in a sessile or sub-sessile manner to its fulcrum of support. 



Spirochona tintinnabulum, S. K. Pl. XXXIII. Figs. 39-42. 



Body elongate-campanulate, tapering posteriorly, and attached by a 

 well-defined adherent disc, widening out and attaining its greatest breadth 

 at its anterior border ; membranous funnel springing from the inner margin 

 of a well-defined peristomal border, equal in height to one-half the length 

 of the body, rising abruptly and elevated in a tongue-like manner, not 

 constituting more than a single turn, its right limb descending into the oral 

 fossa ; endoplast elongate, band-like ; the posterior third of the body 

 frequently enclosing a subtriangular hyaline corpuscle ; the cuticular sur- 

 face usually finely striate transversely. Length of body 1-650". 



Hab.— Fresh water : on the epidermis and branchial appendages of 

 young newts, Triton cristata. 



This species differs essentially from the previously described representatives of the 

 genus Spirochona in the form of its body, which is campanulate, and more like that 

 of an ordinary Vorticclla. In the two former species there is, moreover, a strongly 

 marked constriction between the body and the expanding funnel, which is entirely 

 wanting in the present instance. A still more important character is associated 

 with the funnel itself, which in the new species here introduced takes its origin 

 within the margin of a well-defined peristome, instead of being continuous with the 

 general surface of the body as represented in each of Stein's types, and it being the 

 right limb, as in the more ordinary Vorticellidse, that descends into the oral fossa. 

 Histologically considered, the convoluted funnel of Spirochona would seem to 

 represent the peristome itself drawn out into a membranous spire, the third or basal 



'British Crustacea,' vol. i. p. 374, 1863. 



