NO. 5.] ACCOUNT OF THE SPECIES. 15 



with Vibilia. It is to Dr. Bovallius that we owe the i-estoration of 

 Say's genus, as he pointed out its difference from both Hyperia and 

 Vibilia. Indeed, Dr. Bovallius even regards it as the type of a distinct 

 family, Lanceolidce, at the same time adding no less than 5 new species to 

 that originally described by Say. Of these species, one has been found 

 during the 'Fram' Expedition, and, as only a short diagnosis, accompanied 

 by 4 figures in outhne, has been given of it by Dr. BovaUius, I find it 

 appropriate here to describe and figure this remarkable form more in detail. 



3. Lanceola Clausi, Bovallius. 



(PI. I). 



Lanceola Clausi, Bovallius, 'On some forgotten genera of Amphipoda'. Bi- 



hang till Kgl. Svenska Vet. Akad. Handl. Part 10, p. 8. 

 The Same: 'Arctic and Antarctic Hyperids'. Vega-Expeditionens vetensk. 

 arbeten, vol. IV, p. 553, PL 41, figs. 11—14. 



Description. 



The largest specimen in the collection, the one here figured, has a length 

 of about 10 mm.; but, as Dr. Bovallius gives the length as 16 mm., it 

 cannot be fully grown. 



True, at first sight, the specimen here figured (see PI. I. fig. 1) has 

 the appearance of being an adult gravid female, with largely protuberant 

 marsupium; but, on a closer examination, it is easily seen that this impres- 

 sion is merely due to a delusion. For the fact is that no marsupium at all 

 is formed, and the protruding part that has this appearance, is nothing but 

 the ventral walls of the body itself, along the middle of which, immediately 

 beneath the skin, the ganglionic chain may be very distinctly traced. Indeed, 

 the anterior part of the body-cavity is enormously dilated, in order to give 

 room for the exceedingly capacious stomachal part of the intestine. 



The integuments are remarkably soft and supple, and the whole body 

 thereby acquires a peculiar vagueness in its contours, not observed in other 

 Amphipods. As the metasome generally is bent in against the greatly swol- 

 len mesosome, the whole body looks like an irregular, soft ball. 



The cephalon, unlike what is the case in the true Hyperiids, is very 

 small, and abruptly truncated in front, with the anterior face somewhat con- 

 cave, and bounded above by a projecting, rostrum-like angle. Between the 



