THE AMPHIPODA. 29 



Six species were added to the genus by Bovallius in 1885, but of these in 1887 he 

 withdrew Lanceola curticeps as a synonym of L. fellna. Of four species added by 

 myself in 1888, 1 now propose to withdraw L. SiiJimi as belonging on a balance of proba- 

 bilities to the earlier i. serrata of Bovallius. This leaves at present nine species to be 

 distinguished in the genus, exclusive of L. Murrayi, Norman (see page 30). It is 

 possible that Say's L. pelagica may he identical with the L. Sayana of Bovallius, since 

 the chief mark of distinction rests on a measurement which, at the date when Say 

 wrote, was not likely to have beeu made with much exactness. Between the antarctic 

 L. austmlis and the arctic L. serrata there is also a rather conspicuous resemblance. 



J fPrp. 5 (said to be) not shorter than prp. 2 1. L. pelar/ica, Saj. 



I Prp. 5 shorter than prp. 2. 2. 

 ^ J Prp. 3 not obviously shorter than prp. 4 2. L. Loveiii, BoYsdlms. 



{ Prp. 3 obviously shorter than prp. 4. 3. 



f Rostrum conspicuous. 4. 



o. ■ . 



Rostrum not conspicuous. 5. 

 ^ f Telson as long as peduncle of urp. 3 ?,, L. Smjana, Bovallius. 



I Telson much shorter than peduncle of urp. 3 4. L./e/i/ia, Bovallius. 



j Prp. 4 shorter than prp. 2 5. L. Clausii, Bovallius. 



[ Prp. 4 longer than prp. 2. 6. 



j Picon with medio-dorsal teeth. 7. 



[ Pleon without medio-dorsal teeth. 8. 



„ f Body not carinate G. Z. serrata, Bovallius. 



'■ i Body medio-dorsally angled 7. L. «««//•«/«, Stebbing. 



^ I Telson as long as peduncle of urp. 3 8. Z,. joaci/ca, Stebbing. 



[Telson much shorter than peduncle of urp. 3 9. L. <estiva Stebbino- 



12. Lanceola estiva, Stebbing. 



1888. Lanceola astiva, Stebbing, ' Challenger' Amphipoda, Reports, vol. xxix. p. 1309, pi. 153. 



Two specimens occurred in the collection. The wiiole integument is pellucid, in 

 delicacy almost like tissue-paper. The front of the head is obtuse, without rostrum, and 

 it is doubtful whether the medio-dorsal line of the body is at any part angled, thouo-h a 

 little lateral pressure might easily give a specimen the appearance formerly described of 

 being both rostrate and subcarinate. One of the present specimens, on being dissected, 

 showed otherwise minute agreement with the much larger example described in the 

 'Challenger ' Reports, except that the fifth joint in the second antennic proved to be 

 rather longer than the fourth instead of scarcely so long, and the spines or spinules on 

 the first gnathopods were less numerous. 



Of the species described by Bovallius, both Z. serrctta and L. Loveni are, like L. (estiva 

 hyaline, with the integument very thin and finely reticulated. All the three have the 

 perseopods slender and most of them elongate. The general similarity, indeed, makes it 

 desirable that the distinctive features of each should be carefully noted. 



The character of the rostrum is difficult to use. Of L. serrata Bovallius says, " the 

 obtuse rostrum is scarcely half as long as the rest of the head " ; and of L. Loi-eni, " the 

 obtuse rostrum is almost as long as the rest of the head." WJiat shape of rostrum is 



G* 



