.iriscelluneous. 407 



On new Parasitic Crustacea from the N. W. Coast of America. 

 By W. H. Ball, U. S. Coast Survey. 



More than a year ago I submitted to the Academy descriptions of 

 three new species of Cyami from as many species of Pacific Cetacea. 

 On examination of a small collection of parasites in the collec- 

 tion of the Academy (presented by Captain C. M. Scammon, and 

 reported to have been procured from a Pacific right whale near the 

 island of Kadiak, Alaska, in 1873), I find that it contains two 

 species, both apparently undescribed. It is to be presumed that 

 each species of whale has parasites peculiar to itself; and those who 

 have the opportunity of collecting these interesting animals should 

 lose no opportunity of examining the rarer Cetacea, and should pre- 

 serve the parasites of each species carefully by themselves. As there 

 are many species from which no parasites have yet been collected, 

 there are doubtless as many kinds of Ci/ami which are still un- 

 known. 



The species described on pp. 281-283, vol. iv. of the Academy's 

 'Proceedings' (' Annals,' 1873, vol. xi. pp. 157, 158), have been 

 well figured on plate x. of Captain Scammon's ' Marine Mammals of 

 the ^.W. Coast of America ; ' and, in default of a figure of the 

 present species, I have preferred to give a comparative diagnosis 

 by which they may be more readily distinguished from the figured 

 and other described species. 



Ci/armis tentator, n. sp. 



Species in size and general form resembling C. Scammoni, Dall 

 (Scammon, loc. cit. pi. x. fig. 2), of a pale waxy yellow, with the tips 

 of the branchiae purplish. It diff'ers from C. Scammoni in the fol- 

 lowing particulars : — Head proportionally smaller, not constricted 

 behind the eyes, terminating in a point in the median line behind, 

 which point overlaps a median channel in the body-segment. Second 

 pair of antennae proportionally much longer, equalling twice the 

 length of the head. Second pair of hands with two sharp spike-like 

 tubercles in place of the two rather short and blunt tubercles of C. 

 Scammoni; hands otherwise very similar. Second segment with a 

 broad channel in the median line, widening backward from the 

 head and rather shuUow ; third segment not rounded at its outer 

 ends, but furnished with very prominent knobs at the anterior and 

 posterior corners on each side ; the outer edges of the fourth seg- 

 ment arc also knobbed before and behind, but the anterior knobs are 

 less prominent. The branchiae are not spirally twisted, but are 

 straight, laterally extended cylinders, nearly as long as the width of 

 the segment to which they are attached. There are two pairs on 

 each side of the third and fourth segments in the male. The upper 

 pair on each side are not of equal length, as in C. Scammoni, but the 

 inferior branchia of this pair is much shorter than the other ; both 

 are straight or slightly curved upward and forward. The lower pair 

 exist only in the males ; they are very slender and filiform, and quite 

 short ; in the female they seem to be changed into pouches for the 



