124 



la all the specimens collected, the abdominal appendages were well 

 developed, with stout oblong bases, and with two subequal, multiartic- 

 ulate, ciliate rami, somewhat longer than the base. There is also pres- 

 ent an oblong scale at the apex of the basal portion of the first pair of 

 antennfe. Both these characters are said by Dana to be wanting; and 

 their presence assimilates the genus more closely with Promysis and 

 Macromysis. 



COEOPHIID^. 



CLYDONIN^. 

 CLYDONIA LONGIPES, Dana. 



Clydonia longipes, Dana, U. S. Expl. Exped. Crust., ii, 835, pi. 55, f. 7. — Sp. Bate, Cat. 

 Ampbi. Crust., 284, pi. xlvii, f. 9. 



Locality : North Paci'fic Ocean. The exact locality was lost. 



The specimen in our collection is unmutilated; and, consequently, 

 shows those parts intact that Dana stated were wanting in his. Con- 

 cerning the antennae, he says : " Only two were observed, and these were 

 long, straight, stout, rigid organs, lying side by side, and, excepting the 

 basal joints, hardly articulated, or only indistinctly so." The presence 

 of but two antennae was not an anomalous condition, but an accidental 

 one, owing to mutilation. Commenting on the above statement, Sp. 

 Bate says: "The author does not state which pair of antennae are 

 absent. The superior pair are probably rudimentary." Our specimen 

 shows two pairs of antennae occupying their normal positions, and 

 those described by Dana are not the inferior, but the superior pair.* 



The inferior pair are longer, and more slender organs than the superior, 

 and are folded upon themselves, and partly hidden under the body. They 

 arise from the under and outer surface of the first segment of the cephalo- 

 thorax, posterior find external to the superior pair. The first basal joint 

 is short and stout, more than twice the breadth of the second, which is 

 oblong in shape and longer than the first ; the third article is cylindri- 

 cal, half the breadth of the second and twice as long. At its articula- 

 tion with the second basal joint, it is bent obliquely upward between the 

 basal portion of the superior pair. The flagellum is very long, and at- 

 tenuated toward its extremity, multiarticulate. It extends forward to 

 near the middle of the superior pair, where it is folded back upon itself 



* I will state, for the benefit of future collectors in this field, tbat my collection was 

 preserved unmutilated by mounting the specimens, as soon as caught, in cells upon 

 glass slides. 



