46 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. THAUMATOPSIDjE. 



The first pair of peroeopoda are small, equalling a fifth of the length of the third 

 pair. The femur is almost as long as the four following joints together. The meta- 

 carpus is a little longer than the carpal process. 



The second pair are a little longer than the first, and a little longer than a fourth 

 of the third pair. The femur is fully as long as the four following joints together. The 

 metaearpus is a little longer than the carpal process. 



The third pair are a third shorter than the fourth. The femur is about as long 

 as the three following joints together; the tibia is a little shorter than the carpus; the 

 metacarpus is longer than the carpus. 



The fourth pair are similar to the third in shape, and in the relative length of 

 the joints. 



The fifth pair are longer than the peraeon and the pleon together (14: 11), and 

 more than twice as long as the seventh pair. The femur is a little longer than the 

 carpus or the metacarpus, which are subequal. The carpus is much longer than the tibia. 



The sixth pair are much longer than the seventh. The femur is a third longer 

 than the femur of the seventh pair; the carpus is longer than the tibia, the metacarpus 

 longer than the carpus. 



The seventh pair. The femur is almost as long as the tibia and carpus together; 

 the metacarpus is as long as the carpus. 



The pleonal segments are carinated as the pergonal ones; the first segment with 

 three spine-like prominences, the second and third with two each. The first segment is 

 the longest, the following are equal. 



The segments of the urns are carinated; the second and third are coalesced, shorter 

 than the first. 



The first pair of uropoda reach almost to the apex of the last pair. The outer 

 ramus of the last pair is as long as the coalesced inner one, and much longer than the 

 breadth of the peduncle. 



The original diagnosis of J. C. Fabricius in 1775 runs: 



(Oniscus.) »Spinosus 13. 0. oblongus, corpore spinoso, pellucido. 



"Habitat in Ocea.no Atlantico. Mus. Dom. Banks. 



^Corpus medium, gelatinoso-membranaceum, pellucidum. Caput magnum ro- 

 tundatum, obtusum, marginibus spinulosis. Oculi maximi, contigui. An- 

 tennae dua? simplices, setacese. Seginenta corporis undecim sensim angu- 

 stiora, carinata, carina spinulosa. Abdomen subtus foliolis sex ovatis ob- 

 tegentibus. Cauda brevis, foliolis quatuor bifidis. Pedum septem paria, 1, 

 2, brevia, chelata approximata, 3, 4. 5, 6, longiora, angulata, angulis spinu- 

 losis, articulo ultimo subula.to, simplici, 7, breve, articulo ultimo clavato, 

 unguiculato. 



