1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 185 



Length of dactyliis 2.0 



Leugtli of second peneopod 20 



Length of carpus fi. 



Length of chela 3. 4 



Breadth of chela 0. 8 



Length of dactylus 2.1 



Length of third pera?opod 2H 



Length of morns 7.2 



Length of carpus 1>. 



Length of chela 4. 2 



Breadth of chela 0.75 



Length of dactylus 2. (5 



Length of fourth peneopod 25 



Length of merus 7. 5 



Lengt h of carpus 7.2 



Length of propodus 3.4 



Length of dactylus 2. 5 



Length of tifth pera^opod 40 



Length of ruerus 10. 



Length of carpus 11. 



Length of proijodns 10. 



Length of dactylus 2. 7 



Length of sixth somite of pereon -^ 7. 



Height of sixth somite of pereon 4.5 



Length of telson 7. 2 



Length of inner lamella of ui'opod 6. 5 



Breadth of iuner lamella of uropod 1. 8 



Length of outer lamella of uropod 7.8 



Breadth of outer lamella of uropod 2.6 



I have seen only a single specimen, apparently a female, taken by 

 the Fish Hawk, off Delaware Bay, October 10, 1881, station 1047, north 

 latitude 38° 31', west longitude 73° 21', 15G fathoms, sand, temi»erature 

 49°. 



Tbe remarkable resemblance of this species to Solenocera siphonocera 

 is referred to under that species. 



Solenocera Lucas. 



Excepting the remarkable structure of the anteuuul*, which distin- 

 guishes it Irom all other known Penajidie, and the form of the mandi- 

 bular palpi, in which the distal segment is as broad at base as the 

 prcjximal but elongated and much narrowed distally, this genus is like 

 IIyme)i(>2)encvus, with tlie species of which it agrees in the number and 

 position of tbe brauchite, epipods, and esopods, and in the form of the 

 maxilhp, uiaxillipeds, gnathopods, and perseopods. 



Tbe efferent brancbial tube formed by the two pairs of antennular 

 flaj:ella is well described by Pbilippi, except that tbe inferior flagella 

 enter somewhat unequally into its walls, the superior flagella being con- 

 siderably narrower than the inferior, forming only approximately a sixth 

 of the i)eriphery of the tube, w^bich is very little narrowed distally. 

 The antennular peduncles and tbe antenna! scales form a posterior 

 continuation of the tube which extends backward as a broad channel 



