of the Fishery Board for Scotland. 



329 



(from whom I received the specimens) never having found more than one 

 or two examples at a time. These were taken in the dredge in a 

 depth of from 3 to 5 fathoms. 



Philippi's figures, as far as they go, are characteristic and fairly accurate, 

 agreeing with the Loch Fyne specimens, and with no other British 

 species. I have doubtfully (in the monograph of the British Copepoda 

 vol. ii., Ray Society, 1880) quoted Philippi's specific name as a synonym 

 of Peltidium depressum, Baird. This is a mistake; the difference between 

 the two forms is of generic importance, and the term Peltidium must be 

 held to apply by right of priority to Philippi's species only. The three 

 species referred in my monagraph to the genus Peltidium should hence- 

 forth take Dr Baird's generic name Alteutha.* 



Genus Peltidium, Philippi. 



Body depressed, deeply incised between the segments, ovate, abdomen 

 not distinctly separated from the cephalothorax ; caudal segments small ; 

 anterior antennae short, 9-jointed ; posterior 4-jointed, and bearing a 

 secondary branch of two small joints. Mandibles slender, bidentate, 

 palp composed of two branches attached separately, one composed of two, 

 the other of one joint, setose at the apex. Maxilla not found. First 

 pair of footjaws 2-jointed, the last joint divided into two elongated seti- 

 form segments, one of which ends in two lash-like filaments, the other 

 trifid, with a delicately pectinated subchelate apex, and a rather broad, 

 lateral segment ; the large basal joint has two finger-like marginal pro- 

 cesses, which end respectively in one and two setae. Second pair 2- 

 jointed, the second joint armed with a long terminal claw. Inner branch 

 of the first pair of swimming feet short, and composed of two joints 

 only ; second, third, and fourth pairs with both branches 3-jointed ; fifth 

 pair simple, 2-jointed; last joint elongated and bearing six stout mar- 

 ginal ciliated setse; first joint with two slender apical setae. 



The most important distinctive characters are those of the first foot jaw 

 and the first swimming foot, together with the abnormal mandible-palp. It 

 is possible, however, that one of the appendages here referred to the palp 

 may be homologous with the maxilla. At any rate, with the most care- 

 ful dissection, I have not been able to find a maxilla proper. 



The carapace has a curiously reticulated appearance, owing to a 

 thickening of the coat in certain definite lines, thus leaving large pellucid 

 areas, which are enclosed by lines of dense darkly-coloured chitine. 



Ostracoda. 



Cypris virens, J urine, var. monilifera, no v. 



Shell rather tumid, subovate ; seen from the side subreniform, greatest 

 height situated in the middle, and equal to rather more than half the 

 length ; anterior extremity evenly, posterior somewhat obliquely rounded ; 

 dorsal margin well arched, almost angular in the middle; ventral straight, 

 except for a slight bulging near the front : seen from above the outline is 

 ovate, twice as long as broad, widest in the middle, posterior extremity 

 suba eliminate, anterior showing a broad keeled median prominence. The 

 surface of the shell is smooth, colour olivaceous, with oblique bands of 

 dark green and orange. Just within the anterior border is a row of 

 about eight polished bead-like tubercles. Length, 8-1 00th of an inch. 



* Goodsir's species Carillus oblongus seems to be identical with Alteutha depressa, 

 Baird, and was published in the same year (1845). Which of the two was really first 

 in the field I do not know. 



