NO. 1175. ISOPODS OF THE PACIFIC COAST— RICHARDSON: 851 



There is but one specimen collected by the Albatross in 1888 at 

 Magdalena Bay, Lower California; depth, 12 fathoms. 



Type.— 1^0. 22578, U.S.N.M. 



This species, when, compared with Cleantis planicmida^ Benedict, 

 from Pensacola, Florida, presents points of difference which are 

 interesting and which can easily be recognized in the manuscript quoted 

 below. 



59. CLEANTIS HEATHII, new species. 



Body slender, elongate; surface smooth. 



Head with lateral margins straight; anterior margin slightly exca- 

 vate. P^yes small, lateral. First pair of antenuic consist of four Joints 

 and are a little longer than half the width of the head. The second 

 pair of antenna? are half as long as the body and are composed of nine 



•CLEANTIS PLANICAUDA Benedict, new species. 



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

 out of view from above. Body lined longitudinally, by six more or less broken black 

 lines. Tbe lines on tbe sidi^s are more distinct than those above. 



Head subquadrate, partially immersed in the first thoracic segment and rounded 

 on the posterior margin; sides parallel, anterior margin emarginate; a deep 

 depression or groove runs from the median notch to the center of the head. The 

 eyes are situated near the antero-lateral angle ; post-occipi tal lobe distinct ; antennae 

 with six segments; first very short and nearly immobile; second very short and 

 stout; the third segment is equal in length to the second, but not so stout; the 

 fourth and fifth are of equal length and about one third longer than the second and 

 third segments. The terminal segment or flagellum is lighter in color, and is armed 

 with short bristles. The length of the autenme is equal to the length of the head 

 and first two thoracic segments. The antennube extend to the middle of the third 

 segment of the antennic. The first segment is quadrate; the second subquadrate; 

 the third is pear-shaped; the fourth .segment is very small. 



The segments of the thorax are nearly equal in length and breadth, the third and 

 fourth being but little longer than the others. The epimera of the second, third, 

 and fourth segments are very small and can not be seen from above. On the fifth, 

 sixth, and seventh segments the epimera are large and project well behind the 

 margin of the segment in the form of an acute angle. 



The pleon is composed of four segments; the first three are very narrow; the 

 terminal segment is elongated with subparallel sides. A marked character of the 

 pleon is its obliquely truncated extremity. The oblique terminus is perfectly flat 

 with a raised margin. 



The feet of this species, as in the typical species described by Dana, are in two 

 series. The first is composed of the first three pairs of feet, which are comparatively 

 stout and increase in length to the third segment. The .second series begins on 

 tbe fourth segment with a pair of short feet, which fold transversely, the other 

 pairs are succe.ssively longer and fold backwards. The feet of the second series are 

 much more slender than those of the first. The dactyli of all are biungnlate. The 

 carpal and propodal joints are spinulose beneath. 



The operculum is not traversed by an oblique line. The sides of the basal seg- 

 ment are subparallel. The terminal segment is about as broad as long. 



Length, 15 mm. ; width, 3 mm. 



rijpe.—So. 22579, U.S.N.M. 



