1882.] ‘LIGHTNING’ AND ‘PORCUPINE’ EXPEDITIONS. 667 
that there is a real affinity between Chiton and Patella, and that 
Chiton does not materially differ from other mollusks. Mr. Dall 
also regards the Chitons and Limpets as closely allied. See his 
exhaustive and valuable remarks on the morphology and classification 
of the Chitons in the ‘ Scientific Results of the Exploration of Alaska’ 
(1879), in which he proposed no fewer than 33 genera distributed 
into 9 groups. Dr. McIntosh has noticed that Chitons scoop out 
sandstone like Limpets. Specimens occurred on the coast of 
Bohuslin, in 12 fathoms, on the leaves of Laminaria saccharina. 
2. Curron piscrepans, Brown. 
C. discrepans, Brown, Ill. Conch. p. 65, pl. xxi. f. 20: B. C. iii. 
p- 214; v. p. 198, pl. lv. f. 4. 
‘Porcupine’ Exp. 1870: Atl. St. Gibraltar B., with C. fas- 
cieularis. 
Distribution. Norway and Sweden (Lovén)?, Cornwall and Channel 
Isles to Mogador, Mediterranean and Adriatic ; 0-25 fms. 
Fossil. Pliocene; S. Italy. Post-tertiary : Selsea. 
There are a few obsolete synonyms. 
B. Acanthopleura, Guilding. 
Girdle spinous, without tufts. 
y 3. Curron MENDIcaRIvs, Mighels. 
C. mendicarius, Migh. Boston Journ. Nat. Hist. 1841, i. p. 49 ; 
1842, iv. p. 42, pl. 4. f. 8. 
C. Hanleyi, B. C. iii. p. 215; v. p. 198, pl. lv. f. 5. 
‘Porcupine’ Exp. 1869: St. 2, 65. 1870: Atl. 24 (plate only). 
Distribution. Loffoden and Faroe I. to South Devon, Mediter- 
ranean (Monterosato), Caribbean Sea (Petit), eastern coasts of 
North America; 8-30 fms. 
Fossil. Post-tertiary: Norway. 
C. Nagelfar of Lovén and C. abyssorum of M. Sars appear to be 
this species of unusually large size. The late Mr. Barlee dredged in 
Shetland a specimen an inch long. My Piedmontese shell which I 
named C. Hanleyi turned out to be the young of C. caietanus. 
C. strigillatus of 8. Wood, a Coralline-Crag shell, is more probably 
C. apiculatus of Say, which is also a North-American species ; but 
the fossil is only known from disjointed plates. The ‘‘ Crag” 
Mollusca include many North-American species. The inside of 
each plate in the middle is strengthened by a thick bow-shaped rib. 
C. Lepidopleurus, Leach. 
Girdle irregularly granular. 
Vv 4, CHITON CAIETANUS, Poli. 
C. caietanus, Poli, Test. utr. Sic. i. p. 10, t. iv. f. 1, 2. 
‘Porcupine’ Exp. 1870: Med. Algesiras B. (young). 
