520 'PAGE SKOGSBERG 



Althougli it is quite impossible to identify a species of this group merely by the general 

 shape and appearance of the shell, a fact that is clearly shown in this treatise, subsequent 

 writers have, obviously without any re-examination of Baird's type-specimen, succeeded, as 

 in the case of A. teres (A. M. NOJ^MAN), not only in identifying forms investigated by themselves 

 with this species of Baird's, but also in synonymizing with it forms described in a more or less 

 unidentifiable manner by other writers and ol>viously not investigated by themselves. This 

 can only be explained as being due to these writer's deficient knowledge of this genus. 



Ci/pridina oblonga Grube, from the Adriatic Sea, has, according to the original de- 

 scription and figures, a shell that agrees very closely both in shape and length — 1,55 mm. — 

 with W. Baird's Cypridina Mariae. The limbs and the furca of this species are described, 

 but so incompletely that it is impossible to identify it with certainty, but still this form may, 

 although hesitatingly, be referred to the same group of the genus Asterope as the form of 

 Baird's has been with a reservation referred to above. Without going into details as to the 

 peculiarities in Grube's description and figures that are obviously due to mistakes in obser- 

 vation on the part of this writer, the following characters that appear to distinguish this species 

 may be mentioned here : The mandible has no bristles at all at the middle of the 

 dorsal side of the basale. The sixth limb has only fifteen posterior ventral bristles. 

 The s e v e n t h 1 i m b has eleven bristles, of which six are situated distally, three on each 

 side, and five somewliat more proximally, four on one side and only one on the other. 

 G. 8. Brady's Cylindroleheris Mariae, 1868 b, which was found off Scotland and in the English 

 Channel, differs exceedingly with regard to its shell from this species of Baird's: ,, Carapace 

 as seen from the side, oblong-elliptical, more than twice as long as high, rather higher in 'front 

 than behind." The shell is 2,3 mm. long. Bh AD Y's description and figures of the limbs and the 

 f u r c a are very incomplete and obviously incorrect, so I shall not discuss them at any length 

 here; although they thus do not permit of certain identification they clearly show that the 

 species in question certainly belongs to the same group of the genus dealt with here as that to 

 which the above forms of Baird's and Grube's have been referred. The difference in the 

 shape of the shell from the former species is clearly due to the fact that Brady has described 

 and drawn a mature male while, as has been shown above, Baird had a mature female or a 

 larva. The rather strongly marked dimorphism in tlie shape of the shell has not, if we are 

 to judge from the text, been noticed by Brady, a fact that did not. however, prevent this author 

 from identifying the form examined by him with that of Baird. 



G. O. Sahs, 1887, states that the species Asterope oblonga (E. GRUBE) was found at four 

 localities in the Mediterranean and in the Bay of Biscay*. Both the male and the female are 

 described. This form certainly belongs to the Grimaldi group of this genus. The shape of the 

 shell is tliat which is characteristic of this group. Length, 2,07 mm., ^; 1,7 mm., $. 

 S e c o n (1 a n t c n n a: The endopodite has a very short bristle distally on the second joint. 

 Mandible: At about the middle of the dorsal side of the second protopodite joint there 

 is a single bristle, which is about as long as the dorsal side of this joint. The exopodite is very 



* 1 a|ij>lic(l 111 I'l-nlrssor Sahs lor llic spcciinciis iiu'iitioiifd in order lo rr-rxaiuiuc Unin. tml was inl'oniifd that 

 liiirdHuiialcIv llicy liad all licon lost, bcvoiui any liope of rccovurv. 



