420 
lock’s ‘ Geology of Londonderry,’ &. 
REPORT— 1890. 
From material kindly forwarded 
to me by Messrs. Gray and R. G. Symes, F.G.S., I have been able to 
verify nearly all the species mentioned, and to add others. 
The most 
abundant forms are Patella, Helcion, Purpura, and Rissoa, and the whole 
series suggests their habitat to have been some rocks close by, covered 
with laminaria. 
Few things except shells are present, crab-claws, two 
or three echinoderms, a coral (Caryophyllia clavus), and three polyzoans 
exhausting the list. 
The synonomy of Portlock’s list is in part obsolete, 
and the present one is brought up to date, Portlock’s names, where 
different, being given in brackets. 
Trish Seas. 
Adeorbis subcarinata. 
Aporrhais pes pelecani. 
Barleeia rubra (Turbo unifasciata). 
Buccinum undatum (fide Canon 
Grainger). 
Cerithiopsis tubercularis. 
Cerithium reticulatum. 
(Triforis) adversum (Murex a.). 
perversum. 
Chiton fascicularis. 
»» marmoreus. 
Cyprzea europea. 
Emarginula fissura. 
Eulima polita. 
Fissurella greeca. 
Helcion pellucidum. 
9 (var. leevis). 
Hydrobia ulvee, 
Lacuna divaricata (Turbo canalis). 
» pallidula. 
5»  puteolus. 
Littorina littorea. 
»,  neritoides. 
» obtusata. 
»  rudis. 
» »» (var.) jugosa. 
»,  retusus. 
Murex erinaceus. 
Nassa incrassata (Buccinum ma- 
cula). 
»  nitida. 
»  pygmea (Buccinum mini- 
mum). 
» reticulata. 
Natica Alderi. 
»  catena (N. glaucina). 
»  Montagui. 
Odostoma acuta. 
oH excavata. 
nf) plicata. 
a spiralis. 
3; turrita, 
a unidentata. 
(Chemnitzia) lactea. 
Patella vulgata. 
» var. cerulea. 
Phasianella pullus (Turbo p.). 
Pleurotoma costata. 
Pa rufa. 
+ septangularis(Fusus s.) 
All the species are still present in the 
Pleurotoma striolata. 
(Defrancia) linearis (Fusus 1.). 
Bs purpurea. 
reticulata. 
Puncturella Noachina, 
Purpura lapillus. 
Rissoa albella. 
» cancellata (Cingula cimex). 
»  Cingillus (as Turbo c. and 
R. fallax, n. sp.). 
»  costata. 
»  costulata. 
» inconspicua. 
» parva (Cingula alba). 
on s (var.) interrupta.- 
>»  punctura. 
» reticulata. 
»  semistriata. 
»  Striata (Pyramis s. andZP. 
discors), 
Zetlandica, 
Scalaria clathratula. 
35 Trevelyana. 
Tectura virginea (Patella v.). 
Trochus cinerarius. 
os magus. 
+, tumidus. 
<n umbilicatus. 
> zizyphinus. 
Turritella terebra. 
Trophon muricatus. 
Utriculus truncatulus. 
Terebratula cranium? (fide Port- 
lock). 
Anomia ephippium (also A. squa- 
mula and A. undulata). 
FA striata. 
Arca lactea. 
», tetragona (A. papillosa). 
Astarte sulcata (Crassina scotica). 
» triangularis (Mactra trian- 
gulata). 
Cardium edule. 
a exiguum. 
a fasciatum. 
Aa nodosum. 
