KONGL. SV. VET. AKADEM1ENS HANDLINGAR. BAND. 22. N:0 7. 



1. THEMISTELLA 8TEENSTRUPI, C. BOVALLIUS, 1887. 



PL XIII, fig. 47—60. 

 The name is given in honour of Professor Japetus Steenstrup of Copenhagen. 



Diagn. Caput non duplo altius quam longius, segmenta quattuor prima peraei longitudine rcquans. 

 Segmenta duo priora •peraei coalita, cetera libera. Metacarpus pedum peraei primi paris 

 carpo longior. Pedes secundi paris duas partes pedum tertii paris longitudine ajquantes; 

 processus carpi dimidio marginis posterioris metacarpi paullo longior. Pedes sexti paris 

 pedibus septimi paris multo longiores. Latera segmentorum plei post, rotundata. Segmentum 

 secundum et tertium uri coalita. Ramus interims pedum uri primi et secundi parium di- 

 midium pedunculi longitudine asquans. Telson rotundatum, pedunculo pedum uri ultimi 

 paris angustius, ac quinta parte longitudinis pedunculi ejusdem brevius. 



The head is not twice as deep as long, and is as long as the first four perasonal segments 

 together. The first two perceonal segments are coalesced, the following are free. The 

 metacarpus of the first pair of perasopoda is longer than the carpus. The second pair are 

 two-thirds as long as the third pair; the carpal process in somewhat more than half as 

 long as the hind margin of the metacarpus. The sixth pair are much longer than the 

 seventh. The lateral parts of the pleonal segments are rounded behind. The second and 

 third ural segments are coalesced. The inner ramus of the first two pairs of uropoda is 

 about half as long as the peduncle. The telson is rounded, narrower than, and not a fifth 

 part as long as, the peduncle of the last pair of uropoda. 



Colour. Yellowish brown. 



Length. 4 mm. 



Halt). The tropical region of the Atlantic, Lat. 3° N., Long. 25° W. (S. M.) 



Syn. 1887. Themistella Steenstnqri, C. BOVALLIUS. 



"Systematical list of the Amphipoda 

 Hyperiidea». Bih. t. K. Sv. Vet. 

 Ak. Ilandl. Bd. 11. N:o 16, 

 p. 23. 



The in a 1 e. 



The fore-part of the body is unusually short, the head and perseon together being- 

 shorter than the pleon. The integument is very thin and pellucid. 



The head is about a third part deeper than long. The antennal groove commences 

 above the middle of the front side, and is tolerably broad. The under side of the head 

 is rounded. 



The eyes occupy the whole surface of the head. The eye-cones are very short, and 

 are unusually wide at the apex. 



The first pair of antenna?, (PI. XIII, fig. 48 — 50) reach to the hind margin of the 

 first ural segment. The first joint of the peduncle is very thick and stout, and nearly 



40 



K. Sv. Vet. Akad. Handl. Band. 22. N:o 7. ^ u 



