DISTRlBtJTlON m DEPTH 



153 



rare Pcmopcea Norvegica are swallowed, and ejected again with 

 eroded surfaces. The haddock swallows shells still more indis- 

 criminately, and Mi\ M 'Andrew has found great numbers of 

 rare Pectens in them, but generally spoiled. The cat-fish and 

 skate break up the strongest shell-fish with their teeth — -account- 

 ing for the many angular fragments met with in the dredge, 

 and in recent deposits. 



The following are examples of shells obtained from great 

 depths : — 



Nonoay. (M'Attdrev 

 Living shells. 





rathoms. 



20—150 



10-^130 



200 



120 



200 



120 



40^100 



200 



136 

 132 

 120 



Dead. 



250 

 110 

 150 



Mgmn, (Forbes. 

 Murex vagin attis 



) 



Living, 



80-96 

 8—80 



hh 

 10—105 



60—106 

 are 



105 



90--230 

 12—185 



70—180 

 aa 



Dead. 

 150 



Cerithium metula .>..>).>•••• 



Fusus mUricatus ...,.,... 



150 



Margarita cinerea ...>m">i.. 



Na? sa intermedia 



Cerithium lima 



45—185 







140 







Chemnitzia fasciata ... 

 Eulima distorta 



110—150 







69—140 



Yoldia, limatula 





Scalaria hellenica 



Rissoa reticulata 



Trochus exasperatUs .. 



Scissurella plicata 



Acmea unicolor 



Dent all jm quinquangul 

 Bulla Utriculus . . .. 



110 

 185 



Cryptodon flexuosus 





165 



Off the Cape. (Belcher.) 

 BuccitiumP clathratiun. 



70—150 



150 



150—230 



Volutilithes abyssicola 



Pectunculus Belcheri 



.Mgean^ (i'orbesO 



100 



100 



&0 



40—140 



Spondylus Gassonii .. 

 Pecten Hoskynsii 

 Area imbricata 



185-200 



Liv 



Terebratula vitrea 



Argiope decollata 



Crania ringens , 



Neaera cuspidata 



Tlietis anatinoides 



Kellia abyssicola . ..„. 

 Syndosmya prof undissiE 



40—150 



200 



80-185 



Preserving molluscous animals for examination. 



When shell^fish are killed by sudden immersion in hot watej? 

 or strong spirit, great and unequal contraction is caused, dis- 

 torting the muscular parts and rupturing the membranes. 



Experiments have yet to be made for the discovery of means 

 whereby these and other marine animals may be paralysed and 

 killed, without altering the ordinary condition of their organs.* 



Glycerine is the best medium for preserving such objects as 

 the univalve shell-fish, intended for the examination of their 



* The brittle'Stars {Opkmcoma) are killed by audden immersion in fresh-water; and 

 the Actiniee may be stupifled by adding fresh* water drop by drop until they lose the 

 power of retracting their tentacles. But the bivalves (such as Pholas) may be kept in 

 stale water till their valves fall off with incipient decomposition, and yet the muscular 

 siphons retain theu- irritability, and contract slowly and completely, when placed in 

 spirit. 



h3 



