1856.] 109 



Descriptions of three Myriapoda. 



By Ab. Sager. 



CRASPEDOSOMAD^, Gray. 



Gen. Reasia? Gr. 



Sp. R. SPiNOSA, Nob. Body consists of sixty or sixty-one segments, exclusive 

 of the head and ultimate bivalve scale. Segments all marked with sharp longi- 

 tudinal ridges, the size of which vary considerably. On each side and between 

 the mesial line and stigmata, are seven nearly equal ridges, that border the 

 mesial line somewhat lower than the rest. On the sides are three larger ones 

 terminated with spines, between which there are two smaller and spineless ones; 

 the superior spinous ridge is semi-double and connected with the stigmata ; 

 below these are nine or ten smaller ridges, gradually diminishing as they ap- 

 proach the basis of the feet; anterior and posterior segments about equal to the 

 adjoining ones, head glabrous ; eyes a black triangular patch at the outer base 

 of the antennae ; body cylindrical, chesnut brown, with a paler dorsal line 

 covering the two dorsal ridges, and a pale lateral line covering the series of the 

 stigmata ; feet and antennte rufous. Differs from the Reasia of Gray in eyes, 

 in a triangular instead of a linear spot, and from the Cylindrosoma of the same 

 author in the distinctness of the ridges and not having a reniform eye spot. 



Nearly allied to the Julus lactarius of Say. 



Gen. Stenonia, Gr. 



Sp. S. HispiDA, Nob. Body composed of seventeen double segments, dis- 

 tincly divided on the dorsal mesial line. Body depressed, margins of segments 

 quite prominent and curved forwards near the head, in the middle and poste- 

 riorly transverse or curved slightly backwards. Surface of each segment covered 

 with five rows of distinct tubercles, arranged somewhat in quincuncial order. 

 From the direction of the tubercles the lateral and posterior margins of each 

 segment appear serrated. First cervical segment smaller than the next, rounded 

 anteriorly, straight and narrower behind, and obliquely truncated on the sides. 

 The posterior segment about equal to the next in length, is triangular, the apex 

 armed with a stiff hair. Color pale red above, feet and ventral surface flesh 

 colored. 



Length Q'". Under decayed logs. 



Gen. Strigamia, Gr. 



Sp. S. fulva, Nob. Body somewhat depressed, slightly narrowed towards 

 the extremities, smooth above, rough and villous on the sides and beneath ; feet 

 hairy ; posterior pair equal in length and twice as large as the next; antennal 

 segments obconical, except the last, which is elliptical, and as long as the two 

 preceding ones. Alternate dorsal scut form a slight, obtuse, lateral process. 

 Color fulvous tibove, fawn colored on the sides and beneath. 



Approximates closely to the Geophilus rubens of Say. 



Description of Thirteen New Species of Exotic Peristomata. 

 By Isaac Lea. 



Paludina Hainesiaxa. Testa ventricoso-conoidea, subglobosa, ponderosa, 

 solida, viridi-palida, arctissime umbilicata, Icevi ; spira obtusa, ad apicem carnea ; 

 suturis valde impressis ; anfractibus senis, convexis, ultimo amplo ; apertura 

 magna, subrotundata, intus albida ; columella alba, crassa, incurvata. 



Hab. Siam. S. R. House, M.D. 



-) 



Paludina umbilicata. Testa oarinata, obtuse conoidea, viridi-brunea, sub- 

 tenui, umbilicata, Ijevi ; spira obtusa, babylonica ; suturis linearibus ; anfractibus 

 senis, carinatis, superne planulatis ; apertura subrotundata, intus albida ; um- 

 bilico spiraliter carinato ; columella incurvata. 



Hab. Takroug River, Siam. W. A. Haines. 



