REPORT ON THE GEPHYREA. 9 



Genus 4. Bonellla, Eolaudo. 



Body swolleu. Proboscis much elongated and forked at the apex. There are 

 only two anterior hooked setae. Two internal anal vesicles with ciliated funnels ; only a 

 single anterior segmental organ (the uterus). The male is Planarian-likc, without mouth 

 or anus. 



5. BoneUia suhinii, n. sp. (PI. 1. fig. 3; PI. II. figs. 4-G). 



In fig. 3 is reproduced the original sketch of Willemoes-Suhm. His manuscript 

 notes on the internal structure of this form are not quite correct. He erred by mistaking 

 mouth for anus, and vice versa. 



Anatomical investigation has demonstrated that this form, which was described in 

 V. Willemoes-Suhm's notes as a new genus, is really a true BoneUia. It must be confessed 

 that both the posterior end of the body and the proboscis were torn away from the 

 specimen, that the hooked sette were not to be found, that the intestine was only partially 

 present, and, in general, that the internal organs were much injured and torn. Yet from 

 the following description it will be seen that we have here undoubtedly to do with a true 

 BoneUia. 



Fig. 3 on PI. I. displays the single specimen in its natural size. The dermal muscular 

 sheath was for the most part relaxed anteriorly, and much contracted posteriorly. 

 Over this posterior portion the external skin seemed to be covered by irregularly 

 distributed warts. Of the internal organs the following were preserved (PI. II. fig. 4) : 

 — the anterior portion of the alimentary canal (torn away at y), the oesophageal nerve- 

 ring and ventral cord (n), the uterus {u), with its ciliated funnel, and the two anal 

 vesicles (2, 2), of which the anterior portion is slightly enlarged in fig. 6. 



The uterus (fig. 5) was filled with aljout sixty eggs, which exhibited the characteristic 

 structure of the ripe eggs of the Mediterranean BoneUia. The male was not to lie seen 

 either in the oesophagus or in the uterus. 



Habitat— Station 47, May 7, 1873; lat. 41° 14' N., long. 65! 45' W.; depth, 1340 

 fathoms, off Nova Scotia ; blue mud ; dredged. 



1 have taken this opportunity of giving a figure of the male BoneUia viridis, Rolando, 

 more complete than hitherto (see PI. II. figs. 7-10). 



The males of BoneUia were, as is well knowm, first described by A. Kowalevskv ' as 

 Planarian-like parasites in the uterine portion of the female genital duct. 



The discovery of the Russian embryologist was confirmed by Catta and Marion,- and 



' A. Kowalevsky, Schriften d. naturf. Gesellsch. zu Kiew, Bd. v., and also in a French translation under the title Du 

 male planariforme de la Bonellie, lievue des Sci. Nat., t. iv., Xo. 8, pp. 313-319, pi. vii., 1875. 



2 Ibid. 



(ZOOL. CHALL. E.XP. PART XXXVI. — 188-5.) Nn 



