_^-\-XJ _ 



^■l CI-IJA? 



w- 





(f 



■*• 



SOLENOCEllA AGASSIZII. 



183 



The branchial formuhi is as follows : 



Somites 

 Pleurobrancluai 



YII. VIII. IX 







Arthrobrancliia3 



Fodobranchise 

 Epipods 





 1 



1 

 1 

 1 

 1 



1 

 2 

 

 1 



X, 



1 

 2 

 

 1 



XI. XII. XIII. XIV, 



1 



2 

 

 1 



1 

 2 

 

 1 



1 

 1 

 

 



1 

 

 

 



7 

 10 



1 



(6) 



18 + (0) 



The gill on the eighth somite entered as a pleurobranchia in the above 

 table has been considered an arthrobranchia by some recent authors, but 



I 



from its relative position it woidd seem to be the equivalent of the pleuro- 

 branchia) of the following somites. The epipods consist of a horizontal stem 

 directed backward from the basal segment of the limb; and a vertical forked 

 blade which lies between the gills. 



Length, 93 mm.; carapace, exclusive of the rostrum, 29.5 mm. 



Station 3371. 770 fathoms. 1 male. 



SOLENOCERA Lucas. 



Ann. de la Soc. Eutomol. do Prance, 2d Son, YIII. 219, 1850. 



Solenocera agassizii Fax, 



Plate XL riL, Fig, 2-2'. 



Bull. Mus. Comp. Zool, XXIV. 211, 1893. 



Closely related to 8. dplwnoccra (Philippi), but differing from the latter 

 in having the antennnlar flagella much shorter and snbequalj and more 

 teeth on the upper margin of the rostrum and gastric region. Comparison of 

 a specimen with one of >5. siphonocera of equal size (57 mm. long) from the 

 Bay of Naples shows that in S. agasdzii the antennnlar flagella arc only 

 four fifths the length of the carapace^ and that there are eight teeth on the 

 rostrum and gastric region^ while in S. siphonocera the antennnlar flagella 

 are as long as the distance from the tip of the rostrum to the middle of 

 the third abdominal segment, — or once and two fifths the length of the 



carapace 



and there are but six teeth on the rostrum and gastric region. 

 Moreover, not only is the upper flagcllum broader (1 mm.) and blunter in 

 S. agassim than it it is in S, siphonocera (where it is only ^ mm. m breaatnj, 

 but also subequal in breadth to the lower flagcllum, whereas in the Mediter- 

 ranean species the upper flagcllum is conspicuously narrower than tlie lowei 



one. 





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