AMPHIPODA HYPERIIDEA. I. 2. CYLLOPODID^E. 



The old genus constituting the family is Cyllopus, Dana; probably the animal described 

 by Streets (see below) under the name Hyperia tricuspid 'ata belongs to this family; I have 

 proposed for it the generic name Cyllias; but 1 am not fully sure that I am right in 

 placing it here as I have not examined the animal myself. 



A. The carpus of the first pair of pereiopoda is not broader than that of the second pair, 



which is produced into a process... , 1. Cyllopus. 



B. The carpus of the first pair of pereiopoda is much broader than that of the second 



pair, which is not produced into a process ___...__ . 2. Cyllias. 



Genus 1. CYLLOPUS, DANA, 1852. 



Diagn. Caput globosum, tuniiduni. OcuU grandes, totum fere caput occupantes. Pedes pereii primi 

 paris carpo non dilatato: pedes secundi paris subchelifofmes, carpo plus minusve produeto. 

 Femur pedum septimi paris maximum, articulis sequentibus longius. Telsou parvum, semi- 

 circulatum. 



The head is globular, tumid. The eyes are large, occupying almost the whole head. The 

 first pair of pereiopoda with the carpus not dilated; the second pair are subcheliform, with the 

 carpus more or less produced. The femur of the seventh pair is very large, longer than 

 the following joints together. The telson is small, semicircular. 



Syn. 1852. Cyllopus, DANA. United States Exploring Expedition. Crustacea. Vol. 2, p. 989. 



» » Spence Bate, 1862. Catal. Aniph. Crust. Brit. Museum, p. 305. 



» » C. Bovallius. 1887. »Arctic and Antarctic Hyperids». Vega-Exp. Vetensk. Iakt- 



tagelser. Bd. 4, p. 555. 



The genus Cyllopus was founded in 1852 by Dana for an antarctic Hyperid, taken 

 during the United States' exploring expedition 1838 — 42, under the command of Captain 

 Wilkes. It was one of the many precious additions to the knowledge of the pelagic fauna 

 given by this memorable expedition. The species Cyllopus oiayellanicus was not recognized 

 by the next investigator on the same subject Spence Bate, who applied the name on a 

 specifically different animal viz. Cyllopus Batei (see below); at the same time he proposed 

 two new species viz. Cyllopus Dance and Cyllopus Lucasii, of which the first one possibly 

 is only an elder form of Cyllopus magellanicus, Dana, but the second, Cyllopus Lucasii 

 seems to be a well characterized species. The genus had got no more additions to the 

 number of its species before I made my revision of the tribe. Presently the species are 

 seven in number, the just published new species of Stebbing being added. 

 A. The carpus of the first pair of pereiopoda is not produced. 



a 1. The epimerals of the first four pereional segments are much deeper than 



the following ...- I. C. magellanicus. 



a 2. The epimerals of the first four pereional segments are not deeper than 

 the following. 

 aa 1. The metacarpi of the first and second pairs of pereiopoda are 

 scarcely serrated. 



