138 Mr. R. Guriiey on the Copepod 



uncommon in IIicklin<4 Inroad and Horsey Mere where tlic 

 water is «sliglitly hrac.-kisli *, It is probably widely distri- 

 buted in the Norfolk Broads District wherever there is a 

 trace of salt in the water, since I have also found it in 

 Barton Broad and in the River Ant below Irstead. It also 

 occurs in Calthorpe Broad, which is a very small Broad, 

 not connected with the river, in which the water is, I 

 believe, quite fresh. I have failed to find it in Sutton, South 

 Walsham, and llanworth Broads. 



Mr. Scourfield has sent me a sketch of an Ilarpacticid 

 found by him at Littlehampton this year which undoul)tedly 

 belongs to this species, so that it is probal)le that it is 

 generally distributed in brackish water wherever the vegeta- 

 tion provides a suitable haliitat. I have found it in the 

 decaying leaves oi Sparfjaniumrmnosum and Scirpus lacustris, 

 but it seems to prefer to live under the leaf-sheaths of the 

 dead stems of Typha anyusti folia. I have not hitherto been 

 able to make any observations on its life-history, since I 

 have only once seen an egg-bearing female and have met 

 with only two immature individuals, both of these being in 

 late Cyclopid stages. It seems prol)able that the eggs are 

 not carried in egg-sacs, but are laid freely, and that possibly 

 reproduction is mainly confined to the spring or early 

 snmmer. Against this supposition is the fact that the males 

 always have developed spermatophores in the vas deferens. 



D' Arcythompsonia scotti, sp. n. (PL VII.) 



Body similar in shape to D. jairliensis, Scott, with soft 

 cuticle without markings. The anal operculum of the 

 female is scarcely prominent and somewhat jjointed, while 

 that of the male, as in D, fuirliensis^ is deeply cleft and 

 projects as a pair of conspicuous hooks (PI. VII. fig. 10). 

 The furcal rami in both sexes are tapering, not contracted 

 at the end as in D. fairliensis, with a single large terminal 

 seta which is not jointed as it is in Cyti/iclropsy/lus /cei:is. 

 The second abdominal segment of the male has a median 

 sucker-like projection on the dorsal suiface, which appears 

 to be crowned with a striated horseshoe-shaped membrane 

 (PI. VII. fig. 11). 



The first antenna in both sexes consists of six joints, witli 

 no marked division between basal and distal parts, the largo 

 aesthete being borne by the third joint in the female and 

 by the fourth in the male. In the latter the fourth joint 



* The salinity ia very vnriable, ranging from about 40 to over 70 

 grain* of cbloriuo as clilorides per gallon. 



