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Part III. — Eighteenth Annual Report 



Schizopoda," this Thysanoessa is readily distinguished from its near ally 

 by having a spine over the base of the telson. 



Mysidopsis gibbosa and Mysidopsis angusta have both been obtained in 

 tow-net gatherings forwarded from the Clyde, as also have Leptomysis 

 gracilis and Praunus inermis. Neomysis vulgaris, a Mysid which 

 appears to be rare in the Clyde district, formed part of the contents of 

 the stomach of a fifteen-spined stickleback (Gasterosteus spinachia) 

 captured near the head of Loch Fyne on the 16th of April last (1899). 

 The same Mysid has been obtained in the Dim Loch, near Inveraray. 



Siriella armata (M. Edw.) and Siriella clausii, G. 0. Sars, were 

 obtained in a gathering of Crustacea from Loch Gilp by Mr. F. G. 

 Pearcey, the naturalist on board the "Garland." The first — Siriella 

 armata — has been occasionally captured in the Clyde during recent years, 

 but the second — Siriella clausii — has, so far as I remember, only once 

 before been recorded from the Clyde district, viz., in 1886, when one or 

 two specimens were taken iu East Loch Tarbert. The specimen now 

 recorded from Loch Gilp is a male, apparently full-grown. It was 

 captured in three to five fathoms on 31st October 1899. 



Siriella armata, besides having a strongly produced rostrum, has 

 usually some of the cephalic and caudal appendages ornamented with 

 chocolate-coloured blotches. The body, especially on the ventral aspect, 

 is also occasionally coloured. Siriella clausii appears to be colourless. 



Erythrops serrata, G. O. Sars, and Erythrops elegans, G. O. Sars, have 

 both been obtained in tow-net gatherings of the " Garland " forwarded 

 from the Clyde. Erythrops serrata, which appears to be of more frequent 

 occurrence than the other, has been observed for the most part in gather- 

 ings from the seaward portion of the estuary ; while Erythrops elegans is 

 taken occasionally in Loch Fyne, as well as further to seaward. Both are 

 sometimes infested with parasites. 



Anchialus agilis, G. 0. Sars. — Two specimens of this rare Schizopod 

 were obtained in a tow-net gathering collected at Station VI., Firth of 

 Clyde (a little to the east and north of Sanda Island). They occurred in 

 a bottom tow-net gathering from a depth of 20 to 27 fathoms collected on 

 December 15th, 1898. Sars obtained the Anchialus in the Bay of 

 Naples at a depth of six to eight fathoms, and he also obtained one near 

 Messina at a depth of 20 fathoms. 



Anchialus is one of the many interesting species which Dr. A. M. 

 Norman has added to the British fauna. The single female specimen 

 recorded by him was obtained at Plymouth in 1890. There does not 

 appear to be any previous record of Anchialus from the Clyde estuary. 

 Dr. Norman has seen my specimens. 



Decapoda. 



Xantho hydrophilus (Herbst). — A single specimen of this species — a 

 male — was captured with the shrimp-trawl of the " Garland " at the 

 mouth of the Clyde, at a depth of 60 fathoms, on June 15th, 1899, and 

 forwarded by Mr. Pearcey to the Laboratory, Bay of Nigg, and is now in 

 the collection there. One of the characters that seems to distinguish this 

 form from Xantho incisus, Leach, is that the claws have the movable 

 finger grooved on the upper aspect; the grooves extend nearly the whole 

 length of the fingers. All the joints of the feefc in Xantho hydrophilus 

 are also ciliated on the upper edge, while in Xantho incisus the third only 

 is ciliated. 



Corystes cassivelaunus (Pennant). — A small male specimen of this 

 species was captured in the same gathering as the last, and is now in the 



