No. 26.] ARTHROSTRACA OF CONNECTICUT. I39 



PHOTID^. 



Fourth coxal plates not excavate behind. 



First antennae sometimes as long as second, sometimes longer ; 

 accessory flagellum varying from long to obsolete. 



First and second gnathopods either subchelate or simple ; first 

 never larger than second. First and second pereiopods glandular. 

 Fourth and fifth pereiopods longer than the others. 



Terminal uropods uniramous; first and second biramous. 

 Telson simple. 



Photis Kroyer. 



Posterior abdominal segments elongated and slender. Ante- 

 rior pairs of coxal plates comparatively large and clqsely con- 

 tiguous; fifth pair scarcely smaller than preceding pairs. 



Eyes small. Antennae subequal, and generally densely setifer- 

 ous posteriorly, peduncles elongated ; first pair with no accessory 

 flagellum. 



Mandibles v.-ith elongated palp having terminal joint compara- 

 tively short and densely setose! 



Gnathopods distinctly subchelate ; the second pair being some- 

 what larger than the first pair. First and second pereiopods 

 glandular. Third pereiopods stout and strongly reflexed, with 

 basal joint boldly curved anteriorly and dactyl inverted. 



Last pair of uropods slender and extending beyond others ; 

 rami very unequal, the inner one being very minute, the outer 

 one elongated and having a small terminal joint. Telson ex- 

 tremely small, triangular. 



Photis reinhardi Kroyer. 



1842. Photis reinhardi, Kroyer, Naturh. Tidsskr., vol. 4, 



P- 155- 



1894. Photis reinhardi, G. O. Sars, Crust. Norway, vol. i, 



p. 569, pi. 202. 



Eyes elongated, situated on prominent interantennal lobes; 

 head not as long as first two thoracic segments together. First 

 coxal plates somewhat attenuated distally and rounded at the 

 tip. Second to fifth coxal plates taller than their respective 

 segments; fifth bilobed, posterior lobe small. 



