465 Dr. T. Scott on British Copepoda. 



inner branch is very short, but the outer is of moderate 

 length. The fourth pair differs from the others in having the 

 outer branch, which is short and stout, composed of only two 

 joints, while the inner consists of a small uniarticulate and 

 somewhat rudimentary joint. Fifth pair small, primary 

 joint very short and broad ; secondary joint triangular in form, 

 very narrow at the proximal end, but becoming gradually 

 wider towards the distal extremity. Female with two ovisacs. 



Male unknown. 



Type species Harrietella simulans, T. Scott. Described in 

 1894 as " (?) Laophonte simulans" in the ' Twelfth Report of 

 the Fishery Board for Scotland,' part iii. p. 248, pi. vii. 

 figs. 24-32, pi. viii. fig. 1. 



Habitat. — In crevices of submerged and partly decayed 

 wood ; frequent. 



Remarks. — This Copepod, though closely allied to Lao- 

 phonte, Philippi, may be easily distinguished by its peculiar 

 form, by the structure of the fourth pair of thoracic legs, and 

 by the female bearing two ovisacs, instead of one as in 

 Laophonte. 



Genus Pseudodiosaccus, T. Scott, nov. 



Body tolerably robust and somewhat similar in form to 

 Diosaccus, Boeck. Anterior antennae composed of eight 

 joints; posterior antennas two-jointed, the outer ramus being 

 also composed of two joints. Mandibles stout, with the 

 biting-edge strongly but irregularly denticulated ; mandible- 

 palp similar to the same appendage in Diosaccus, having the 

 basal part furnished with a single uniarticulate branch. 

 Maxillae compact in structure, the masticatory lobe broad and 

 with the obliquely truncated apex provided with tolerably 

 long spine-like teeth. The other mouth-organs and the first 

 three pairs of thoracic legs similar to those of Diosaccus. In 

 the fourth pair the inner branch, which is considerably 

 shorter than the outer, is slender and composed of only two 

 joints. The fifth pair are normal in structure. 



Female with two ovisacs as in Diosaccus. 



Type species Pseudodiosaccus propinquus, T. Scott. 



1893. Diosaccus propinquus, T. Scott, Ann. & Mag. Nat. Hist. ser. 6, 

 vol. xii. p. 237, pi. xi. fig3. 1-6. 



This species, which was described from specimens dredged 

 in the Moray Firth at a depth of 130 fathoms, certainly 

 belongs to the family Diosaccidae. Its structure exhibits a 



