236 CARL B0VALL1US, AMPHIPODA HYPERIIDBA. I. 2. HYPERIID.^. 



Hyperia thoracica. 



The second pair of antenme are longer than the first; the flagellum consists of nine 

 subequal, very short joints. 



The perceopoda are like those in the adult male, only a little thicker. 



The female. 



PI. XI, fig. 40. 



The forepart of the body is much wider, and more tumid than in the adult male; 

 the head and peraeon together are considerably longer than the pleon and urus together. 



The first pair of antennce reach scarcely beyond the under margin of the head. 

 The single flagellar joint is provided with about a dozen long olfactory hairs on the 

 inner side. 



The second pair of antenna? reach only a little farther down than the first pair; 

 the first free joint of the peduncle is longer than the second, the third is not fully as 

 long as the two preceding together; the glandular cone is about half as long as the first 

 joint. The single flagellar joint is somewhat longer than the whole peduncle, and is 

 fringed with short hairs along the under margin. 



The perceopoda are like those in the male. 



The pleon is shorter than the peraeon. The segments are dorsally armed with 

 spine-like projections as in the male. 



The urus is somewhat broader than in the male, and the first segment is scarcely 

 more than a third longer than the last coalesced. 



21, HYPERIA GILESI, n. sp. 



The name is given in honour of Dr. G. M. Giles. 



Diagn. Caput permagnum, parte coalita pera?i longius. Segmenta quinque prima percei coalita, cetera 

 libera. Carpus pedum percri primi paris dilatatus, productus, processum formans dimidium 

 marginis posterioris metacarpi longitudine superantem. Carpus pedum secundi paris valde 

 productus; margo anterior processus carpalis dimidio marginis posterioris metacarpi multo 

 longior. Metacarpus pedum primi et secundi parium spinis destitutus; margo posterior 

 indistincte serratus. Pedes tertii ac quarti parium pedibus parium duorum prascedentium 

 paullo longiores; carpus metacarpusque non serrati; dactylus longus. Pedes parium trium 

 ultimorum duobus prascedentibus paullo longiores; femur latum; carpus tibiam longitudine 

 ajquans; tibia, carpus, metacarpusque non serrati. Segmenta phi non producta; latera 

 segmentorum post rotundata. Pedunculus pedum, uri ultimi paris plus quam duplo longior 

 quam latior. Telson rotundatum, latius quam longius, segmento ultimo uri brevius, pe- 

 dunculo pedum uri ultimi paris latius, et dimidio pedunculi ejusdem brevius. 



The head is very lai'ge, and is longer than the coalesced part of the peraeon. The first five 

 perceonal segments are coalesced, the last two are free. The carpus of the first pair of 

 perceopoda is dilated, and produced, forming a process which is more than half as long as 



