54 S. I. Smith — ■ ('/ ■// 'stiici a of the Alhatross Dredgings. 



oms; three species of a remarkable new genus allied to 

 Pasiphae, and also to Hymenodora and some other genera of 

 Palaemonidio, which shows that Paspha'e is closely allied to the 

 Palsemonidse ; a large Penseid, a foot in length, referred to the 

 little known genus Aristeus ; and a large Sergestes three inches 

 in length. 



The great size of some of these new species of shrimp is 

 remarkable, but is far exceeded by two of the previously 

 described crabs. Oeryon quinquedens, from 105 to 588 fathoms, 

 is one of the largest Brachyurans known, the carapax in some 

 specimens being five inches long and six broad, while one spe- 

 cimen of the great spiny Lithodes Agassizii measures seven 

 inches in length and six in breadth of carapax, and the out- 

 stretched legs over three feet in extent. 



Among the Schizopoda there are two large species of Qnath- 

 ophausa, one over four inches in length, and a Lophogaster, all 

 from below 2000 fathoms. One of the most interesting Schiz- 

 opods is a small Thysanoessa (a genus of Euphausidae) from 398 

 to 1067 fathoms, of which one female was found carrying eggs. 

 The eggs are carried in an elongated and flattened mass beneath 

 the cephalothorax, are apparently held together by some glu- 

 tinous secretion, and are attached principally to the third pair 

 of perseopods (antepenultimate cephalothoracic appendages). 

 This apparently confirms Bell's statement in regard to the egg- 

 carrying of Thysanopoda Couchii, which is, as far as I know, 

 the only published observation of egg-carrying in any of the 

 Euphausidae. 



The AmphipOda from deep water are comparatively few in 

 number and have not yet been carefully examined, but among 

 them is one specimen of the gigantic Eurytlienes gryllus Boeck 

 (Lysianassa Magellanica Milne-Edwards), probably the largest 

 of all known Amphipoda. This specimen, which is over four 

 and a half inches long, and very stout in proportion, was taken 

 in 1917 fathoms, north lat. 37° 56' 20", west long. 70° 57' 30". 

 The few previously known specimens came from Cape Horn, 

 Greenland, and Finmark, and have apparently all been taken 

 from the stomachs of fishes. This species and its occurrence 

 in the extreme arctic and antarctic seas, has been much discussed 

 and is the subject of a long memoir by Lilljeborg, but the 

 apparently anomalous distribution is explained by its discov- 

 ery in deep water off our middle Atlantic coast. 



The great differences in depth through which some of the 

 species range is worthy of notice, several species ranging more 

 than 2000 fathoms, as shown in the list, given further on, 

 of species taken below 2000 fathoms. I have not yet noticed 

 distinct varietal differences due to depth in any species, though 

 there is often a very marked change in the associating species. 



