506 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Measurements in millimeters — Continued. 



Station 



Sex 



Length of first perseopod . . . 



Length of chela 



Breadth of chela 



Length of dactyhis 



Length of second peraeopod . 



Length of chela 



Breadth of chela 



Length of dact.ylua 



Length of third perseopod . . 



Length ot propodua 



Length of dactvlus 



Lengtli of fourth perseopod . 



Length of propodus 



Length of dactylus. 



Length of fifth perseopod 



Length of propodus 



Length of diictylna 



Height of third somite of pleon 



Lengt h of its dorsal spine 



Length of sixth somite of pleon 



Height of sixth somite of pleon 



Length of telson 



Length of inner lamella of uropod. 

 Breadth of inner lamella of uropod 

 Length of outer lamella of uropod . 

 Breadth of outer lamella of uropod. 



2105. 



2099. 



17.5 

 3.9 

 0.8 

 1.2 



20 

 4.2 

 0.5 

 1.2 



26 

 7.1 

 2.1 



21 

 7.6 

 0.5 



11.0 

 8.4 

 8.2 

 4.6 



14.0 

 9.7 

 2.1 



10.6 

 2.b 



19.0 

 4.4 

 0.9 

 1.3 



22 

 4.9 

 0.6 

 1.4 



27.0 

 8.0 

 1.9 



25 



8.7 

 0.6 



12.0 

 9.0 

 9.3 

 5.2 



15.3 



2.5 



11.0 



3.1 



Specimens examined. 



Locality. 

 N. lat. W. long. 



37 12 20 

 39 22 00 

 37 50 00 



69 39 00 

 68 34 30 

 73 03 50 



Nature of bot- 

 tom. 



Globigerina ooze 

 Globigerina ooze 

 Globigerina ooze 



Specimens. 



Date. 



1883. 

 Oct. 2 

 Oct. 3 1 

 Nov. 





Ephyrina, j;en. nov. 



This gfeuus, which is based ou a single specimen, wanting the greater 

 part of the second, third, and fourth perseopods, is readily distinguished 

 from Acanthephyra by the ischial and meral segments of the fifth perae- 

 opods, which are compressed, very broad, and form broad lamellar oper- 

 cula along the sides of the carapax. The single species is further dis- 

 tinguished by the unarmed rostrum, the non-cariuated pleon, and the 

 broad anterior division of the distal segment of the i^rotognath of the 

 second maxilla. In all other characters it agrees essentially with the 

 species of Acanthephyra. 



Ephyrina Benedicti, sp. uov. 



In general the form of the carapax proper is very similar to that of 

 Acanthephyra Agassizii^ but the antennal and branchiostegial spines are 

 less prominent. An obtuse dorsal carina extends forward from near 

 the posterior margin and gradually rises in front into a very high and 

 sharp carina at the base of the laterally compressed lamellar rostrum, 



