ACADEMY OF SCIENCES. 53 



nately with rings of red and white, of which there are 29 of the former color, 

 and 32 of the latter, without counting that on the head. 



The difference in number between the red and white rings arises from the 

 fact that the red rings die out upon the hinder part of the tail, which has 

 white rings only. 



The red rings in many cases do not cross the back, but are divided by the 

 junction of a pair of black rings. The black rings become wider on the cen- 

 tre of the back, approaching, and in most cases, joining each other in pairs, 

 but always at the expense of the red rings, the white rings being invariably 

 continuous with the white of the abdomen. There are traces of red on parts 

 of the abdomen, and the black rings can generally be partially traced across 

 the abdominal scutellse. 



The specimen in this collection has six upper labials on one side, and seven 

 on the other, the sixth and largest on the left side, being represented by two 

 shorter plates on the right side. 



Length of body, 13 inches; of tail, 2 inches. 



Abdominal scutelke, 198; sub-caudal, 45; dorsal rows of scales, 23. 



Locality, Northern California. Presented and collected by Paymaster 

 Stanton, TJ. S. N. 



In Baird & Girard's catalogue, p. 153, Blainville's description of Coluber 

 zonatus, of which those authors had seen no specimens, is given, and appears 

 to agree in most particulars with the species here described, but the nostrils 

 are hollowed out of the anterior nasal, and the color is different. Blainville 

 describes his specimen as " Keddish white, entirely annulated with deep 

 black, with two half rings of the same color on the head." It is very prob- 

 ably the same species, and for this reason I have preserved his specific name 

 of zonatus, but the entire last abdominal scutella, want of carination of dorsal 

 scales, and smaller number of abdominal scutellse, appear to me to necessitate 

 the formation of a new genus. 



W. Gr. W. Harford read a paper describing a.uew genus and 

 three new species of Sessile Eyed Crustacea. 



Description of a New Genus and three New Sneeies of 



Sessile Eyed Crustacea. 



BY W. G. W. HAKFOBD. 



Lockingtonia. n. g. 



Antenna? not appendiculate. First three segments of the pleon dorsally 

 carinated, and posteriorly produced to an acute point. Three posterior seg- 

 ments of the pleon not furnished with fasciculi of spines on dorsal surface. 

 Eyes, round. Telson, single. Habitat, fresh water. 



The above genus agrees with Dexamine and Atylus in its non-appendiculate 

 antennae. It differs, however, from the former in having the first pair of 

 guathopoda chelate, three instead of four anterior segments of the pleon 

 dorso-posteriorly produced to a sharp point, and from the latter in the man- 



