180 REPORT— 1866. 



^ger Marderi — a genus hitherto characteristic of the Soleuhofen Slates of 

 Bavaria*. 



The following new genera and species of Crustacea were communicated 

 by me to the Geological Society on the 23rd May last, and will appear in the 

 next part of the ' Quarterly Journal' of that Society : — 



" 2. ' On a new Genus of Phyllopodous Crustacea from the Moffat Shales 

 (Lower Silurian), Dumfriesshire.' 



" The fossil described consists of the disk-shaped shield or carapace of an 

 Apus-like Crustacean, the nearest known form to it being Peltocaris apty- 

 clwkles, Salter, from which, however, it is at once distinguished by the 

 absence of a dorsal furrow. 



" A line of suture divides the wedge-shaped rostral portion of the shield 

 from the rest of the carapace, the two parts being seldom found together. 

 From its strong resemblance to Discina, the author proposed for it the generic 

 name Biscinocaris, and named the species Bron'mana, after Mr. D. J. Brown, 

 who first drew his attention to it. 



" 3. ' On the Oldest known British Crab (Palceinachus hngijies, H.W.) from 

 the Forest Marble of Malmesbury, Wilts.' 



" The author stated that three genera and twenty-five species of Brachy- 

 urous Crustacea had ali-eady been described by Professor lleuss and H. von 

 Meyer from the Upper White Jura of Germany ; but as no limbs or abdo- 

 minal segments had been met vd\h, it was more doubtful where to place 

 them than the species now described, which had nearly all its limbs in situ, 

 and a portion of the abdomen united to it. Palmmichus closely resembles 

 the common Spider-crabs (the Maiadce and Lejptopodidce) living on our own 

 coasts. 



" 4. ' On the Species of the genus Eryon, Desm., from the Lias and Oolite 

 of England and Bavaria.' 



" The g(;nus Eryon of Desmarest was established for certain extremelj'^ broad 

 and flat forms of Astacidce found in the Soleuhofen limestone near Munich, 

 and first described in 1757. The late Dr. Oppel has recorded fourteen 

 species, two of which, E. Barrovensis and E. (C'oleia) antiqims, are from the 

 Lias of England. Mr. Woodward gave descriptions and figures of E. Barro- 

 vensis, M'Coy, and five other species, namely: — E. crassichelis, E.Wilmcoiensis, 

 and E. Brodiei, from the Lower Lias ; E. Moorei, from the Upper Lias of 

 Ilminster ; and E. Oppeli, from the lithographic stone of Solenhofen." 



The plates exhibited form (with one other) the first part of the Monograph 

 on the Merostomata for the Palceontographical Society, and wUl be published 

 shortlyf. 



I have lately had the opportunity to examine specimens of Limuli from 

 the Coal-measures of Kilmaurs, Dudley, and Coalbrook-dale, and am happy 

 to state that they have enabled me in the most satisfactory maimer to de- 

 monstrate the connexion between this division of Crustacea and the older 

 Euriipterida on the one hand and the recent King-crabs on the other. (See 

 Eeport, Section DJ.) 



The forms which occur in this zone (the Pennystone Ironstone) differ 

 from Limulus in the less anchylosed condition of their segments and the 

 possession of three well-marked divisions, representing the head, thorax, and 

 abdomen, the latter being represented by three anchylosed segments, and 

 having the intervening segments of the thorax free and unarticulated. 



* See Geol. Mag. 1866, vol. iii. p. 10, pi. 1. 



t They have since (Dec. 1866) appeared. 



j Also Quart. Journ. Geol. Soc. vol. xiiii. p. 28. 



