NO. 1350. NATURAL HISTORY OF THE ISOPODA— RICHARDSON. 



51 



mcnts, the last segment l)eino- small, rounded posteriorly, and without 

 appendages. The four anterior segments ai-(^ provided eaeh with two 

 pairs of double-branched appendages, a pair on either side, the outer 

 appendages of the swollen si(l«> luMiig nuieii more developed and (don- 

 gate than those of the smaller side, and extending as long leaf-like 

 lamellse over the ineubatorv pouch: the separation of each appendage 

 into two branches occurs some distance from the seg- 

 ments. 



Incubatory pouch extremely large, occupying the whole 

 ventral side of the thorax and extending laterally on one 

 side a considerable distance beyond the ill-detined outline 

 of the body. The lamella? of the narrow side of the l)ody 

 are small, and crowded together as four small plates. 

 Those of the other side are developed and suthce to form 

 the marsupium. Only four plates are present on this side 

 also, the iirst lamella extending anteriorly over the dorsal 

 surface of the head, concealing the antenna" of the first 

 pair which are composed of two very much flattened joints. 



Color of female white, with large areas of dark reddish 

 brown on the marsupium and thorax. 



Male. — Body narrow, elongate. Segments of thorax 

 distinct. Abdomen composed of a single piece, with no 

 trace of segmentation; outline rounded, or ovate. No rudiments of 

 appendages. Eyes wanting. 



Three specimens were found on the abdomen of Pdlxmoii xerv'ifer 

 (Stimpson). They were collected by Jordan and Snyder at Misaki, 

 Sagami, Japan, in 1900. 



TyiJe.—K^^i. No. 28961, U.S.N.M. 



Fig. 28. — Male 



() F I) 1 1" I, o - 

 P H R Y X U S 

 J O R D A N I . 



\ 01. 



III. 



TWO NEW CYMOTHOIDS FROM THE WEST COAST OF 

 CENTRAL AMERICA. 



The two species new to science, herein described, were collected by 

 Dr. C. H. (xilliert on the west coast of Central America from Panama 

 and Mazatlan. Both were found in the mouth of J/ii<j!l ho.spes. 



LIST OF REFERENCES. 



Ed\v.\rds, Milne. Hist. Nat. Crnst., Ill, p. 271. 



ScHicEDTE, J. C, and Meinert, F. SyniI)ola' ad indnoLrraiihiam Cymothoanim, 

 Crustaceorum Isopodum Fainilia'. — I V. Cyniothoida', Trib. II. Cymothoina\ 

 Trib. III. Livonecinw. Naturliistoriyk Tidsskrift (:!), XIV. 18S.S-S4, pp. 884- 

 336, pi. xiii, figs. 7-8. 



. 8ymbola' ad MonographiaiuC^vmothoarnin, Crustaccornm Isopodum 



FamiliiK. — III. Saophrida'. IV. Cyinotlmida', Trib. I. C'cratothoina'. Natur- 

 historisk Tidsskrift (3), XIII, ISSl-s:;. pp. 33r)-340, pi. xui, (i<rs. 11-15; pi. xiv, 

 figs. 1-4, 5. 



