KONGL. SV. VET. AKADEMIEN,? HANDLINGAR. BAND. 22. N:0 7. 5 



aaa 1. The metacarpi of the fifth and sixth pairs of pereiopoda 



are more than twice longer than the carpi 2. C. Dansp. 



aasi 3. The metacarpi of the fifth aud sixth pairs of pereiopoda 



are only a little longer than the carpi 3. C. levis. 



aa 2. The metacarpi of the first and second pairs of pereiopoda are 

 serrated. 

 aaa 3. The peduncle of the last pair of uropoda is not twice as 



long aa the rami 7. C. Hookeri. 



aaa 4. The peduncle of the last pair of uropoda is twice longer 



than the rami 4. C. armatus. 



aaa 5. The peduncle of the last pair of uropoda is four tinies 



longer than the rami 5. C. Batei. 



B. The carpus of the first pair of pereiopoda is produced into a process.. 6. C. Liicasii. 



1. CYLLOPUS MAGELLANICUS, DANA, 1852. 



Cyllopus magellanicus, Dana. 

 Facsimile from Dana, U. S. Expl. Esp. Crust. II, pl. 68, fig. 1. 



Diagn. Caput subrotundatum, non productum, segmenta tria prima pereii longitudine asquans. Antennce 

 primi paris ajquiter latitudine decrescentes, acuminatfe. Segmentiun primum pereii brevis- 

 simum, segmentum quartum et quintum longissinia. Epimera quattuor prima sequentibus 

 multo altiora. Carpus primi paris pedum pereii non productus, longitudine metacarpum 

 sequans. Carpus pedum secundi paris paullo productus, metacarpo multo brevoir. Metacarpi 

 pedum quinti ac sexti parium carpis fere duplo longiores. Pedes septimi paris femore pedum 

 sexti paris longiores; femur post non excavatum articulis sequentibus ter longius. Latera 

 segmentorum plei rotundata, serrulata. Segmentum secundum ac tertium iiri libera, non 

 coalita. Pedunculus pedum uri primi paris ramis fere brevior, pedunculus pedum secundi 

 paris ramos longitudine asquans, pedunculus pedum tertii paris ramis paullo longior. Telson 

 quartam partem longitudinis pedunculi pedum uri ultimi paris ajquans. 



The liead is nearly round, not produced, as long as the first three pereional segments. The 

 first pair of antennce are shai-p-pointed, evenly tapering toward the end. The first pereional 

 segment is the shortest, the fourth and fifth the longest. The first four pairs of epimerals 

 are much deeper than the following. The carpus of the first pair of pereiopoda is not 

 produced, as long as the metacarpus; the carpus of the secoad pair is a little produced, 

 much shorter than the metacarpus. The metacarpi of the fifth and sixth pairs are almost 

 twice as long as the corresponding carpi. The seventh pair are longer than the femur of 

 the sixth pair; the femur of the seventh pair is three times longer than the following joints 



