1869. ] SEARLES WOOD—BOULDER-CLAY. 93 
Sele ‘3 :| & 
O18 18 a Ss 
Name of the Shell. = ious Figg ee Remarks. 
WI2@i2 8) | 284 
Ee(go/2] £33 
jo) tal Sl ea 
Hiei jo] 4a 
Mangelia linearis?, Mont. ...... * *| B,S. | The Middle-Glacial shell departs 
from the Crag linearis in being 
less slender, and in having more 
numerous coste. 
Cancellaria viridula, O. Fad. ...|...|.-- % | % A. Admete viridula of Woodward’s 
list. C. costellifera, J. Sow., of 
‘Crag Mollusca.’ 
Trichotropis borealis, Brod.g Sow.|... * |?| B,A. | This species occurs in the Coralline 
Crag only; but the Coralline- 
Crag form is a very distinct va- 
riety from the Bridlington shell. 
Natica clausa, Brod. § Sow. H/*] x | x A. 
Montagui, Forbes............ * |...| B,S. | Iceland and Norway also. Naples, 
sec. Jeffreys. 
greenlandica, Bech ......... x |?) BA. 
—- occlusa, S. Wood ............|-++ x |*| A? | Recently identified by Mr. Jef- 
freys with a Spitzbergen shell. 
—— helicoides, Johnston........- |... * |x| BA. 
eatena, Dacosta ............ %}%|... |*| B,S. 
Scalaria groeenlandica, Chemn....|*|...| * | % A. 
Trevelyana? Leach .........|--- x ...| B,S. | TheMiddle-Glacial specimen is too 
broken for certain identification. 
Turritella polaris, Beck .........].-|... * A. T. erosa of ‘Crag Mollusca’ and of 
Woodward's list. 7. clathratula 
of ‘ Crag Mollusca.’ 
inerassata, J. Sow. ......... ve] o.. | % O. Very abundant inMiddle Glacial. 
—— terebra, Linn. ....cccccceseee 1%] x% |#| B,S. |Z. communis of ‘CragMollusca’ and 
of Woodward’s Bridlington list; 
one fragment only from Middle 
Glacial. Mr. Leckenby knows 
no other form of Turritella from 
Bridlington than T. erosa. Given. 
therefore on the authority of 
Woodward’s list. Very rare in 
Crag. 
Chemnitziainternodula, S, Wood)...| * *| O02 | Several broken specimens from the 
Middle Glacial. Said by Mr. 
Jeffreys to have recently been 
dredged living. 
Odostomia unidentata, Mont. ...|...| * * B. Unique in Crag. One specimen, 
with mouth perfect, from Mid- 
dle Glacial. 
Rissoa obsoleta, S. Wood......... wef * O. Coralline Crag only. 
—— semicostata? Woodward...|...| * u O. Two specimens from the Middle 
Glacial, but too imperfect to 
show whether they be the ex- 
tinct R. semicostata, with the 
denticulated lip, of the Crag, or 
the living &. inconspicua, a B,S 
: form. 
Littorina littorea, Linn. ......... “%|*| * |+*|B,A,S 
— rudis, Maton § R. ......... ¥/*]... |*«|B,A,S 
