127 



have an eye which has every appearance of being a coalesced pair. The extruded egg 

 is carried on the ventral surface just above the hind spine. 



Dr. Kellicott discovered this fine Anurcea in Niagara water at Buffalo, and soon after 

 Mr. Levick found it in Olton reservoir. I am indebted both to Mr. Levick and Mr. 

 Dunlop for many living specimens, and to Mr. Levick also for several mounted. 



Length. Total, \j- inch ; of longest spine, T -Ju inch. Habitat. Buffalo, U.S. 

 (Dr. D. S. Kellicott) ; Birmingham (Mr. J. Levick) ; Greenock (Mr. M. F. Dunlop). 



N. THALASSIA, Gosse, sp. nov. 

 (PL XXIX. fig. 2.) 



[SP. CH. The two lorica-plates commensurate; dorsal arched, long-ovate in out- 

 line ; ventral, with pectoral edge straight. Marine. 



The antlers and lateral spines are moderate, nearly straight and sub-equal : the 

 intermediate pair mere tubercles. The pectoral edge has no conspicuous unevenness. 

 The lorica is scarcely changeable in outline, as if it were stiff and unyielding. Yet the 

 shelly substance merges so insensibly into thin and evanescent membrane at the hind 

 end (where a very delicate membrane, like a truncate tail [rectum?] is protruded), that 

 we cannot determine the point of transition. The form and lobes of the front, and the 

 array of fan-like setae ; the brain and great eye ; the mastax and jaws ; and the 

 abdominal organization, do not notably vary from what we see in Anurcea. The broad 

 protrusile and retractile membrane at the cloaca excretes mucus for temporary anchorage. 

 One which I saw forcing its way through thick clusters of diatoms, emerged with several 

 of them glued to its rear, which were then detached with some difficulty. In free 

 swimming it is headlong and rapid, and very restless. In one example the intestinal 

 canal was full of the frustules of diatoms. It is exclusively marine. P.H.G.] 



Length, T | g inch. Habitat. Tide-pools in the Firth of Tay (P.H.G.) : common. 



N. SCAPHA, Gossc, sp. nov. 

 (PL XXIX. fig. 1.) 



[SP. CH. Lorica nearly as broad as long ; dorsal plate greatly exceeding the ventral 

 in width ; pectoral edge sinuate. Marine. 



The transverse outline is highly rounded, resembling the half of an egg-shell, far 

 within the margins of which a flat (ventral) plate is fixed across the cavity, leaving wide 

 overhanging edges. The lorica is very flexible, so that, when the fore-parts are forcibly 

 retracted, the dorsal outline suddenly appears perfectly circular, except at its spinous 

 front edge, and then bears much resemblance to that of a Bracliionus. The cloacal 

 orifice is a very short and thin fissure at the extremity, and does not extend sensibly up 

 each side. 



In swiftly swimming, the wide but thin wing-like expansions of the dorsal plate are 

 very conspicuous by their glassy clearness, and by their peculiar form, especially when 

 seen end-wise ; and this gives a very distinct aspect to the species, which is more than 

 usually attractive. When alarmed it suddenly retracts with a snap ; and if it happens 

 to be presented sidewise at the moment, the frontal spines close with the sinuous pectoral 

 edge, so as to cross and interlace. I saw one eagerly feasting on an Actmophrys, and 

 watched it for half-an-hour. At first the frontal cilia worked energetically at it, gradu- 

 ally drawing it into the open front of the lorica, and holding it there. But the jaws 

 were not applied to it ; and it seemed as if the ciliary action alone were drawing off 

 invisible gelatinous juices into the buccal funnel. Yet, when at length the Notholca 

 relinquished its hold, the prey seemed uninjured. The species has been sent me by Mr. 

 Hood, associated with the preceding, in sea-water from the estuary of the Tay. - P.H.G.] 



Length, 1( } () inch. Habitat. Firth of Tay (J.H.). 



