THYSANOPODA. 207 
Sta. 4676. Dec. 5, 1904. Lat. 14° 28.9’S., long. 81° 24’ W. 300 fms. to surface. 1 specimen. 
Sta. 4679. Dec. 7,1904. Lat. 17° 26.4’S., long. 86° 46.5’ W. 300 fms. to surface. 1 specimen. 
Sta. 4681. Dec. 8, 1904. Lat. 18° 47.1’S., long. 89° 26’ W. 300 fms. to surface. 2 specimens. 
Sta. 4683. Dec. 9, 1904. Lat. 20°2.4’S., long. 91°52.5’W. 300 fms. to surface. 2 specimens. 
Sta. 4707. Dec. 29, 1904. Lat. 12° 33.2’S., long. 97° 42’ W. 300 fms. to surface. 1 specimen. 
Sta. 4722. Jan. 16,1905. Lat. 9°31’S., long. 106° 30.5’ W. 300 fms. to surface. 1 specimen. 
Sta. 4740. Feb. 11,1905. Lat. 9° 2.1’S., long. 123° 20.1’ W. 300 fms. to surface. 3 specimens. 
Distribution.— According to the literature this species is known from the 
Atlantic, where it extends northwards to Lat. 46° 15’ N. and southwards to a 
place off Tristan da Cunha; also from the Bay of Bengal, the Indian Archi- 
pelago, and South of Australia. 
It is a true bathypelagic species and this explains perhaps that among the 
twelve specimens from seven Stations in the East Pacific only a single specimen 
(from Sta. 4707) seems to be really adult. 
THYSANOPODA H. Mitne Epwarps (1830). 
The material of this large and somewhat difficult genus is very rich, com- 
prising nine species; a young specimen, which is very far from adult though not 
small, I have with some doubt referred to 7. cornuta Illig, of which a much 
larger specimen is at hand. Only two valid species of this genus are not found 
in the collection, but both are known only from the North Atlantic.! 
The maxillulae differ much from each other in various species, affording 
excellent specific characters, especially characters for quite small groups of 
species. In a couple of species the outer lamella from their first lobe, the 
“pseudexopod,” is somewhat small, at most slightly overreaching the outer 
margin of third joint, while in most species the pseudexopod is of moderate 
size or very large, with its greater part reaching beyond the outer margin of 
third joint; furthermore the fourth joint, the palp, differs extremely as to 
length and breadth in various species. For these reasons I have given figures 
of the maxillulae of most species— The maxillae of various species differ 
generally but little in shape, and therefore it has been deemed unnecessary to 
figure more than the maxilla of a single species. 
Group a. Carapace without any distinct cervical groove. Mazxillulae with 
the pseudexopod from moderately large to very large, with at least almost their half 
situated beyond the outer margin of third joint, and with the palp at most moder-— 
ately long and somewhat overreaching the third joint. Sixth abdominal segment 
longer than the fifth. 
1 Thysanopoda megalops lig as re-established by that author in July, 1911, on a specimen from 
the Indian Ocean is certainly a young and most probably the young of 7’. egregia H. J. H. 
