852 ORDER TENTACULIFERA-ACTINARIA. 



high magnification, corresponds in contour, structure, and comportment with that 

 of Ophryodendron porcella/mm, next described, but the terminal cirri are much less 

 numerous. These cirri, under the same conditions, were observed to be very dis- 

 tinctly granular and adhesive. Attempts to make the animalcules incept carmine 

 particles, or to ingest any other food, were not rewarded with success. The indepen- 

 dent vermiform zooids in the process of mounting became readily detached from their 

 fulcra of support, their surface of adhesion being demonstrated in this connection 

 to be simply acetabulate. 



Ophryodendron porcellanum, S. K. Pl. XLVIIIa. Figs. 20-25. 



Body of primary zooids sessile, subspherical, or cushion-shaped ; the 

 proboscis highly extensile, developed subcentrally, flattened and trans- 

 versely rugose ; its apex bearing a brush-like tuft of innumerable cirrate 

 processes ; secondary zooids sessile, attenuate vermiform, independent or 

 associated with a basal cushion-like body similar to that of the primary 

 animalcules. Length 1-400". 



Hab. — Salt water: Jersey (S.K.), on the limbs of the flat-crab, /"^r- 

 cellana platycheles. 



When first discovered by the author at St. Heliers, Jersey, in March 1878, this 

 species was supposed to be identical with either the Opiiryodeiidron sertularice of 

 Strethill Wright or the Ophryodendron abielinuni of Claparbde and Lachmann. While 

 a subsequent acquaintance with the first-named type enables the author to dis- 

 tinguish it from the first-named form, in connection more especially with its less 

 depressed body and redundant development of cirri at tlie extremity of the pro- 

 boscis, the following points may be cited, in addition to its habitat, as separating it 

 distinctly from O. abieiinum. In the first place, the body of the proboscidiform 

 zooids is never elongate cup-shaped or pynform, as in 0. ahietinum, but always 

 presents a subspherical or slightly flattened contour. The zooids of the second order 

 are, again, when isolated, much more elongate or vermiform. More often, however, 

 as personally examined, these vermiform individuals have been associated with a 

 subspherical body similar to that of the primary zooids (PI. XLVIIIa. Fig. 23), and 

 from which, indeed, they are indistinguishable but for the exception that the 

 characteristic proboscis is here replaced by a long spout-like tube. This tube, it 

 may be reasonably anticipated, is homologous with the proboscis of the primary 

 forms, and develops later on into the same In other minor details, such as the 

 flattened form of the proboscis, as also in the greater number of the cirrose filaments, 

 this species is readily distinguished from either of the preceding tj'pes. On no 

 occasion could less than fifty or sixty of these cirrose filaments be counted, while in 

 many instances they were found to exceed one hundred. These terminal cirri, when 

 examined with the aid of a magnifying power of from 800 to 1000 diameters, 

 were found to be eminendy tenacious, adhering readily to the surface of the glass 

 object-carrier, and at times, during the act of extension of the proboscis, progressing 

 over its plane surface by an apparently independent creeping action. 



Ophryodendron pedicellatum, Hincks. Pl. XLVIIIa. Fig. 16-19. 



Zooids of both classes furnished with slender curved pedicles : body of 

 primary or proboscidiform zooids symmetrically cup-shaped, with an 

 even, sharply defined anterior border; proboscis cylindrical, attenuate, 

 highly extensile, bearing at its extremity eight or ten subequal tentacular 

 processes ; secondary zooids flask-shaped, attenuate anteriorly. Dimensions 

 unrecorded. 



Hab. — Salt water, on Pltimnlaria pinnata : Ilfracombe, Devonshire. 



