619 



gwislied by the narrow form of tbe basal joint, and by the fact that the last 

 pair of uropoda are unusually slender. The C. tenukornc of Norman is 

 without any doubt the female of this species. 



Occuyycncc. — I have met with this form not infrequently in several 

 places both of the south and west coasts of Norway, as also in the Trond- 

 hjerasfjord, in depths ranging from 10 to 30 fathoms. It extends northwards 

 to the Lofoten islands. 



Dhtrilmtion. — Bohuslan (Bruzelius), Kattegat (Meinert), the east 

 Frisian coast (Metzger), Shetland Isles (Norman). 



Gen. 4. Unciola, Say, 1818. 

 Syn.; Glaucononie, Kr0yer. 



Body more or le^^s slender, depressed, with small, angular, coxal plates. 

 Cephalon produced in front to a distinct rostrum, lateral lobes small. Eyes either 

 distinct or imperfectly developed. Superior antenuEE provided with an acces- 

 sory appendage, and longer than the inferior ; the latter more strongly built 

 in male- than in female, having in the former a very movable articulation 

 between the penultimate and antepenultimate joints of the peduncle, flagellum 

 multiarticiilate. Mandibular palps well developed, 3-articulate. Maxillipeds 

 witli the masticatory lobes short and broad, armed inside with strong flattened 

 spines. Gnathopoda rather unequal, the anterior ones being much stronger 

 tlian the posterior and somewhat differing in male, propodos large and broad, 

 subcheliforra. Pereiopoda comparatively slender, the 3 posterior pairs succes- 

 sively increasing in length, and having the basal joint more or less expanded. 

 Pleopoda normally developed. Last pair of uropoda very small, with the 

 basal joint expanded inside. Telson comparatively large, lamellar, I'ounded. 



Bemarls. — This genus was established by Say as early as in the 

 year 1818 to include a North American species, U. irrorata. The genus 

 Gkinconome of Krayer is uiuloubtedly identical with that of Say. The genus 

 is somewhat allied to Corophinm, yet differs very markedly in the presence 

 of a distinct accessory appendage to the superior antennae, as also in the 

 structure of the gnathopoda. Besides the typical species and the 2 Norwegian 

 forms described below, a 3rd species, U. petalocera, was detected during the 

 Norwegian North Atlantic Expedition, and 2 additional Arctic species have 

 been described by Dr. Hansen as U. crassi^ws and U. Joficori/i.t. 



