252 
W. M. Wheeler 
ses dimensions considerables , n’obstrue pas completement le tube 
digestif de la comatule.« 
V. Graff says iiothing- aboiit tbe sex of the specimen wbich be 
examined. Prouho liowever distinctly affirms tbat M. puhmar is 
dioecious, witli a »dimorpbisme sexuel bien accentue«. The speci- 
men whicli V. Graff described corresponds to' the female of Prouho, 
The male is thiis described by the French author: »Le male ne 
mesure que 1 mm de longueur siir 0.8 mm de largeur; il est accroche 
anx teguments de la femelle sur laquelle il peut se deplacer assez 
rapidement. Il est aplati, elliptique, rappelant par sa forme les 
Myzostomes libres. Son tube digestif n’est pas ramifie, mais montre^ 
de chaque cote, les amorces des trois ramifications que presentent 
tous les autres Myzostomes ; sa bouche, situee tout pres du bord mar- 
ginal, est ventrale. Il possede deux testicules, un de chaque cote du 
tube digestif, munis chacun d’un canal deferent debouchant sur la 
face ventrale.« 
Prouho’s remarks show unmistakably that M. puhmar closely 
resembles some of the cysticolous species described by v. Graff 
(M. cysticolum^ tenuispinum^ toillemoesii^ etc.) in presenting large 
female and small male individuals. 
My own observations on this species are based on some 30 spe- 
cimens taken in the Bay of Sorrento. About half of these would 
correspond to Prouho's males, the remainder to his females. The 
living females are of a beautiful coral red color, sometimes inclin- 
ing to yellowish; the males are white and somewhat translucent. 
I have been able to confirm Prouho’s notes on the habits of this 
species in every particular. I have, however, frequently seen the 
scoop-shaped posterior end of the female Myzostome protruding from 
the Crinoid’s mouth like a little red tongue. 
The female specimens which came under my notice measured 
2.75—3.5 mm in length and 3.75 — 4.5 mm in breadth. One of these 
specimens is represented in dorsal and ventral view in PI. 12 Figs. 41 
and 42. Fig. 41 shows two males ijuv) attached near the cloacal 
orifice [an]^ which is situated on the dorsal surface, and another on 
the postero-lateral edge of the body. These males when magnified 
(Fig. 43; ventral view) appear like typical Myzostomes of another 
species. They measure 0.5 — 0.85 mm. In most cases only a single 
male is borne by a female. 
The association of these Myzostomes in pairs at once recalls the 
similar conditions in M. glahrum and M. alatum^ and although the two 
