REPORT ON THE COPEPODA. 87 



Sub-family 2. Pontettince, Dana. 



In this sub-family there are two or more paired lateral sessile eyes, in addition to a 

 large median eye, which is situated near the base of the rostrum, and is more or less 

 prominent, and covered by an excessively convex lens. 



Pontella, Dana. 



Pontia, Mine-Edwards, Hist. Nat. des Crust., 1828. 1 

 Pontella, Dana, Amer. Journ. Sci., 1846. 



„ Glaus, Hie frei lebenden Copepoden, 1863. 



„ Brady, British Copepoda, 1878. 

 Pontcllina, Claus (in part), Die frei lebenden Copepoden, 1863. 

 Monops, Lubbock, Ann. and Mag. Nat. Hist., 1853. 

 Labidoeera (Iva, Ivella), idem, ibidem, 1853. 



Head distinct from the thorax, fourth and fifth thoracic segments coalescent. 

 Abdomen of the male five- (sometimes three- or four-) of the female two- or three- 

 jointed. Anterior antennae twenty-one to twenty-four-jointed ; sixth and seventh joints 

 either coalescent or distinct ; right antenna of the male more or less swollen in the 

 middle from the thirteenth to the sixteenth, and hinged (usually) between the nineteenth 

 and twentieth joints; seventeenth, eighteenth, and nineteenth united into one long joint 

 which bears a serrated plate on its inner margin, twentieth and twenty-first joints also 

 coalescent and serrated. Posterior antennas bearing a large secondary branch. Man- 

 dibles well-developed, strongly toothed at the extremity, and bearing a palp composed 

 of a large basal joint and two short branches. Maxillae well-developed, composed of 

 a broad, prehensile, or chewing portion, and a large three-lobed palp. Anterior foot-jaw 

 robust, with strongly plumose setae; basal portion of the posterior foot-jaw stout, divided 

 at the apex of the inner margin into three (often indistinct) digits, which bear about six 

 strongly plumose setae; apical portion much more slender, elongated, four-jointed, seti- 

 ferous. 2 Inner branches of all the swimming feet (except occasionally the first) two- 

 jointed. Fifth pair of feet in the male adapted for clasping, that of the right side 

 usually larger than the left. Lower eye stalked; two upper eyes often coalescent, 

 composed of numerous refracting bodies, with two large, simple, more or less closely 

 approximated lenses. 



Dana (1852) has proposed to divide the genus Pontella into three sub-genera, 

 characterised as follows : — 



' 1. Calanopia. — Including the Calanoid Pontellae, in which the anterior antennae are 

 situated as in Calanus, with the tips not anterior to the line of the front ; the anterior 



1 This generic name, though prior in date, is discarded, having been already used by Fabricius for a lioiius of 

 Lepidoptera. 



2 The details of the mouth-organs, &c, given in PI. XXXIX. (Pontella hi byt ri) represent the typical generic structure. 



