826 ORDER TENTACULIFERA-SUCTORIA. 



Hemiophrya Thouleti, Maupas. PL. XLVIII. FIG. 19. 



Body usually subquadrate or trapeziform in lateral aspect, the anterior 

 border being the wider ; pedicle not exceeding one-half the length of the 

 body, thick and inflated superiorly, abruptly constricted at its proximal or 

 adherent extremity ; suctorial tentacles short, ranging from two to five in 

 number, originating distinctly from the internal or endoplasmic region ; 

 prehensile tentacles more numerous, attenuate, superficially developed, 

 grouped in an irregular circle round the anterior border of the body, 

 verrucose and granulate when contracted ; contractile vesicle single or double, 

 anteriorly located ; endoplast subcentral, horseshoe-shaped or irregular, 

 often nodulate ; parenchyma brownish-yellow. Length of body 1-900" 

 to 1-500". HAB. Salt water. 



This species was obtained on one occasion only by E. Maupas in the neigh- 

 bourhood of Algiers, the animalcules being in that instance, however, so abundantly 

 developed as to literally cover the Hydroid polyps which gave them support. 

 Hemiophrya gemmipara was found sparingly in its company. Multiplication by 

 abundant external gemmation after the manner of the last-named species was 

 observed. 



Hemiophrya crustaceorum, Haller sp. PL. XL VII. FIG. 8. 



Body subspherical, of a yellowish hue, mounted on a long cylindrical 

 pedicle, whose greatest width, at the distal end, equals one-half the 

 diameter of the body, and thence tapers off to its point of attachment, its 

 total length averaging eight or ten times that of the body, its external 

 surface throughout the anterior half finely striate transversely, that of the 

 succeeding or basal moiety entirely smooth ; suctorial tentacles short, 

 few in number, distinctly capitate, those of the prehensile series attenuate, 

 very numerous, exceeding the body in length, the external surface sub- 

 spirally granulate, radiating from all parts of the periphery ; reproductive 

 granules developed in great abundance over the entire surface of the body, 

 but chiefly upon the anterior body-half. Length of body 1-300". 



HAB. Salt water, upon a species of Caprella. 



This type has been recently described incidentally as a species of Podophrya, by 

 G. Haller, in an article devoted to the morphology of the Lemodipodous Crustacea.* 

 In its general contour it to some extent resembles the Podophrya conipes of 

 Mereschkowsky, but is necessarily, with reference to the dimorphic character of the 

 tentacles, referable to the genus Hemiophrya. The number of reproductive gem- 

 mules produced upon the external surface of the body, as indicated in the figure 

 given by Haller, exceeds that hitherto recorded of any other species of the genus. 



Hemiophrya pusilla, Koch sp. 



Body and other structural details closely resembling those of Hemiophrya 

 Thouleti, but the pedicle two or three times as long as the body. Length 

 of body 1-300". HAB. Salt water, on Plumularia setacea. 



* "Beitrage zur Kenntniss der Lcemodipodes filiformes," 'Zeitschrift fur Wissenschaftliche 

 Zoologie,' Bd. xxxiii., 1878. 



