404 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



first four segments there are single lateral spines on the transverse 

 median line similar in size, shape, and direction to those of the dorsal 

 line. 



The pleon consists of a single elongated segment with subparallel 

 sides ending in a blunt apex. On each side of the pleon are two widely 

 separated angular projections. 



Type.(Mt. No. 15786, U.S.N.M. 



66. Genus CLEANTIS Dana. 



Flagellum of second antenn* consolidated to form a single article 

 or formed of only a restricted number of joints. Epimera of all the 

 segments of the thorax with the exception of the first distinctly sepa- 

 rated from the segments. Abdomen composed of more than one seg- 

 ment, distinct and visible in a dorsal view. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS CLEANTIS. 



a. Abdomen composed of four distinct segments, three short ones anterior to the 



terminal segment. 



b. Maxillipeds with a palp composed of five articles. Posterior portion of abdomen 

 obliquely truncated, the oblique terminus having a raised margin anteriorly. 



Cleantis planicauda Benedict 



I/. Maxillipeds with a palp composed of four articles. Posterior portion of abdo- 

 men flat, in a lower plane than the anterior portion and having a median 

 groove extending forward some distance into the anterior portion. 



Cleantis occidentalis Richardson 



a'. Abdomen composed of three segments, two short ones anterior to the terminal 

 segment Cleantis heathii Richardson 



CLEANTIS PLANICAUDA Benedict, b 



Cleantis planicauda BENEDICT in RICHARDSON, Proc. I T . S. Nat. Mus., XXI, 1899, 

 p. 851 (footnote); Ann. Mag. Nat. Hist. (7), IV, 1899, pp. 271-273 (foot- 

 note); American Naturalist, XXXIV 7 , 1900, p. 229; Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 544. MOORE, Bull. U. S. Commissioner of Fish and Fish- 

 eries, XX, Pt. 2, 1902, p. 174, pi. xi, figs. 1-6. 



localities. Pensacola, Florida; Arroyo, Porto Rico. 

 Body linear, densely granulated, five times longer than broad. Feet 

 folded beneath out of view from above. Body lined longitudinally by 



The type species of the genus, Cleantis linearis Dana, has the abdomen composed 

 of four distinct segments, three short ones anterior to the terminal segment. Cleantis 

 planicauda and Cleantis occidentalis agree in this respect with the type. Cleantis 

 heathii may have to be removed to another genus, but as only a single specimen 

 exists of this species, I prefer to let it remain, for the present, where it was originally 

 placed. The maxillipeds have five joints to the palp in C. planicauda and four 

 articles in C. occidentalis. In order to be consistent, they should also be separated 

 into different genera, but inasmuch as I have not examined the type species of the 

 genus it is not possible to tell which one agrees with the type in this respect, or in fact 

 if either do. Therefore I have decided for the present to keep both species in the 

 genus as defined by Dana. 



6 The description that follows is from Doctor Benedict's manuscript. 



