AT 4. Part 11.—Twentieth Annual Report 
recently Giesbrecht* have described as the male of Cancerzlla. There is 
in some respects a similarity in the structure of Caligidiwm with that of 
Cancerilla, but I am not sure that the relationship between the two has 
been fully established. Dr. Edward Graeffe in his fauna of the Gulf 
of Trieste retains Caligidium vagabundum, Claus, ‘under its distinctive 
name, without any reference to its sexual relationship with Cancerdla. + 
HERPYLLOBIIDA. 
Salenskya tuberosa, Giaxrd and Bonnier. Pl, XXV., figs. 17-22. 
1895. Salenskya tuberosa, Giard and Bonnier, Contrib. 4 l’étude 
des Epicarides ; Bull. Scient., vol. xxv., p. 472, pl. xiii. 
A few specimens of this remarkable form were found fixed between the 
thoracic legs of Ampelisca spinipes, Boeck, dredged near North Craig, 
Firth of Forth, on July 7th, 1901. They agree very closely with the 
figure of Giard and Bonnier, who obtained a single female and three 
‘pygmy males” on a specimen of the same amphipod from Le Croisie. 
The female (fig. 17) measures about ‘84 mm. (34 of an inch) in length, 
and it is about as broad as long; one or two of the females carried two 
globular ovisacs, each one being nearly as large as the copepod itself. 
No appendages are present. 
What seem at first sight to be the males, but, as Hansen jhas shown 
(Choniostomatide, p. 19), are really the larve-—the adult males being 
degenerate like the females—(fig. 18) measure about 15 mm. (;4; of an 
inch). The anterior segment of the body is comparatively greatly dilated, 
the remaining segments are small. The antennules are very short, and 
three (or four) jointed, and furnished with two terminal sete and a club- 
shaped appendage represented in the figure (fig. 19). Two pairs of limbs 
which represent the first and second maxillipeds are shown in figures 12 
and 13. 
My son, when dissecting the larvee, was able to make out two pairs of 
thoracic feet; each foot appeared to be composed of a two-jointed basal 
part and a single one-jointed branch, which was armed with two small 
spines on the exterior margin, and four plumose on the inner margin and 
apex. 
This description will be found to differ (possibly by reason of age) 
from the character shown by Giard and Bonnier, and my figures show a 
further difference in a greater segmentation of the hinder part of the 
abdomen. 
Tt is very probable that the parasite is congeneric, and quite possible 
that it is identical with Rhizorbina ampliscee, Hansen, described from 
Ampelisca laevigata, Lilljeborg, by Hansen, in 1892 (Entomol. Med- 
delelser, il, pp. 207-234, pl. iii.), a memoir which I have not yet been 
able to consult. + 
Order OSTRACODA. 
A considerable number of Ostracoda have been observed in the dredged 
material examined during the year, but as they apparently all belong to 
described species which for the most part are more or less generally dis- 
tributed, I will only refer to the two following which appear to be some- 
what rare. 
3 i un u. Flora d. Golfes u. Neapel, vol. xxv., Astrocheriden, pp. 95 and 112, pl. x. 
gs. 1-il. 
a ‘on d. Golfes v. Triest, Arbeit. el Zoolog. Institute za Wien, t. xiii., haft 1, p. 438 
2! desire to express my indebtedness to Prof. D’Arcy W. Thompson for the identifica- 
tion of this interesting crustacean, as well as for other information concerning it. 
