Case and 



Colngaion Reference to McCoy's 
Drawers. | Synopsis: and Figures of Genera. 
Gh 
Gh 
G 
case and 
Gh 
Phyllopods. 
The small bivalve species 
have their affinity with the 
Limnadia, but look like water- 
fleas (Cypris). 
Gh 0 
Gh 00 
Gh 

| Olenus, Dalman. 
ters of Paradowides, but with a glabella nar- 

Primitia vexata, Hicks. Brit. Assoc. Report. 
MENEVIAN GROUP. 
Names and References; Observations, &c. 
[Arionellus longicephalus, Hicks MSS. A 
genus new to Britain. In Dr. Hicks’ cabinet. | 
The less convex and less distinct glabella, and 
the narrower axis of the body, distinguish this, 
as a species, from A. ceticephalus, Barr. 
| [It is possible the two species of Olenus and the 
Hymenocaris major should be included in 
the Ffestiniog Group. They lie close under 
it.] 
With many of the charac- 
rowed in front, and but 14 body rings at 
most. 

Olenus , sp. (Olenus gibbosus, Belt. Geol. 
Mag. 1867, not of Swedish authors(?). The | 
Swedish species are not sufficiently figured 
yet: and ours appears to have too many 
spines to the tail, and a wider front. 
Olenus cataractes, Salter (Decades Geol. Sur-_ 
vey, No. x1 pl. 10, fig. ref.). Differs from the 
common species in the next formation, by 
the gradually tapering, not abruptly nar- 
rowed, body. Mem. Geol. Surv. 11. p. 300. 
The specimens b. 294, pres. by Mr. D. Hom- 
fray, shew the effects of cleavage in shorten- 
ing or lengthening the body, the spines, &c. 
In this state it might be taken for many 
different species. 
| 
| 
Primitia Solvensis, R. Jones, Ann. N. H. s. 4. 
2.55, Specimens in Mus. Pract. Geology. 
| Primitia buprestis, Salter (punctatissima, Jones). a. 
A large species like a small bean. | 
| Hymenocaris (Saccocaris, Halifax Trans. 1867) © 
major, Salter, n.s. A large ovate carapace, 
strongly emarginate behind, and larger than — 

~I 
Numbers and Localities. 
St. David’s. Cast, present- 
ed by Dr. Hicks. 
b. 268, b. 269, River Maw- 
ddach, at Tyn-y-groes, N. 
Wales. (Mr. D. Homfray.) 
| a. 7, Maentwrog falls, Ffes- 
tiniog. b. 294,Caen-y-coed, 
near the falls. (Mr. D. 
Homfray.) a.11, Ynys cyn- 
| hauarn, Treflys, near Port- 
madoc. (Pres. by Mr. Ash.) 
a, 246, a, 248, Cae Gwernog, 
Upp. Mawddach: and a. 
247, Cefn Deiddwr. a. 261, 
Moel Ispray. (All pres. by 
| Mr. Plant.) 
St. David’s. (Dr. Hicks.) 
a. 287, do. do. 
a, 282, do. do. 
b. 297, Caen-y-coed, near 
Maentwrog. (Mr. D. Hom- 
fray.) 
H. vermicauda, see p. 10. Body segments | b. 297, body segments of 
broad and short, at least in seven of the | 
anterior ones. Appendages not known. 

the same. 
and donor. 
Same locality 
