CRUSTACEA MALACOSTRACA. III. 203 



of the four families designated by me as subfamilies in 1895, as only the Entoniscidae have no repre- 

 sentative. But as to three points the material is of real importance. The first point is that I have 

 found a species of the Cryptouiscidae in the marsupium of two genera of Cumacea, and no Epicarid 

 was previously known from any form of this order. The second point is not less interesting. It is a 

 well-known fact that in the second larval stage of the Dajidse the mouth terminates in a circular, 

 somewhat funnel-shaped sucking-disk, while such a disk was not known in any larva of the three 

 other families. Now I have found that the mouth of the second larval stage of Bopyroidcs hippolytcs 

 Kr. terminates in a somewhat similar disk, thus in this respect bearing much similarity to those in 

 the larval Dajidae, while in all other features, as antennulae, antennae, posterior legs, uropods, the larva 

 of Bopyroidcs agrees with the larvae of the Bopyridae and differs widely from those of the Dajidae — 

 but consequently the analytical key to the larvae of second stage of all Epicaridea in my Plankton- 

 paper ought to be altered as to this character. The third point of interest is, that in the marsupium 

 of two specimens of the same species of Astacilla from the same station I found two genera of Crypt- 

 ouiscidae, both new. — Finally it may be emphasized that the second larval stage affords excellent 

 specific characters, especially in the antennulae, which therefore must be examined more in detail than 

 generally is the case. 



Family Bopyridae. 



Only three genera are known from our area, each with a single species. 



145. Bopyroides hippolytes Kroyer. 

 (PI. XV, figs. 1 1 a— 1 id). 



1838. Bopyr/ts Hippolytcs Kroyer, Groul. Amfip., in Kgl. D. Vid. Selsk. natur. math. Afd. p. 306; PL IV, 



fig. 22. 

 (?) 1846. — — Kroyer, in Gaimard, Voy. en Scand., Crust. PI. 28, figs. 2 a — 2 p. 



! 1897. Bopyroidcs hippolytcs G. O. Sars, Account, II, p. 199; PI. 84, fig. 2. 

 IC po. _ Sarsi Bonnier, Contrib. a L'Etude des Epic, p. 378; PI. XU. 



I9 o^ _ hippolytcs Richardson, Monograph, p. 567, figs. 628 — 637 (with synonymy and 



distribution). 



To Sars' representation of both sexes I have nothing to add, and follow him in considering 

 the parasites of the three species of Spiro/itocaris, viz. S.polaris Sab., S. spinas Sow., and S. Lilljcborgii 

 Dan., as belonging to the same species. 



Second larval Stage. I have examined a larva inhabiting a feeble swelling of the cara- 

 pace of S.polaris, which certainly would have developed into a female and is vz mm. long, and a 

 larva placed on a very young female infesting a young S.spinus, and this larva is certainly of the 

 male sex and 092 mm. long. 



The body is somewhat more than three times as long as broad, and on the upper surface set 



with extremely fine, short hairs. — The front margin of the head is broadly convex. Eyes black, 



26* 



