26 CATALOGUE OF CEPHALOPODA. 



*** The ripper Arms longest; rest gradually shorter, to the lowest. 



4. Philonexis htalinus. 



Body short, broad, smooth, oval, larger before than behind ; aper- 

 ture verv large ; diaphanous, whitish, marked with red. Head 

 short. Eyes large, prominent, subpedunculated. Arms un- 

 equal, not webbed, as long as the body; order of length, 1, 2, 3, 4 ; 

 upper much longer than the lower. 



Octopus hyalinus Hang, Feruss. et If Orb. Mon. Ceph. Cryptod. 

 Poidpes, t. 16. f. 1. 1835 ; Rang, Mag. de Zool. 1837, cl. v. 66. 

 t. 92. 1837. 



Philonexis hyalinus If Orb. Mon. Ceph. Acet. 104., Poulpes, t. 16. 

 f. 113. 1838, Moll. Viv. et Fos. i. 205. 1845. 



Hab. Atlantic Ocean. 



**** The Arms very long, free, very slender. Cups far apart. 



5. Philonexis tuberculatus. 



Body oval, pointed behind, very large, smooth above ; beneath co- 

 vered with small, short, horny tubercles, united by netted ridges ; 

 aperture very large. Head short, not very distinct ; water-bearing 

 apertures four, two above and two below. Arms slender, elon- 

 gate, nearly equal ; comparative length, 1, 4, 2, 3 ; scarcely webbed. 

 Cups distant, united in each line by an intermediate membrane. 

 Siphuncle very large, larger than the head.— Brown, silvery 

 beneath ; arm bluish. 



Octopus tuberculatus Risso, Hist. Nat. Eur. Merid. iv. 3. n. 4. 

 1826 : Belle Chiaje, Mem. iv. 55, 56. t. 55. n. 3. 1832 Mem. 

 sur TAplysia, p. 68. note. 



Octopus reticularis Petagna, Rappelle delle Sc. di Napoli, 1826 

 (1828). 



Octopus catenulatus Ferussac, Poidpes, t. 6. 6*. 6**. 1828.^ 



Octopus Verany Wagner, Zeitschr. fur die Org. Phys. ii. 1828, 

 Bullet. Univ. des Sc. Nat. xix. 388. n. 3. 



Polpo di Ferussac Delle Chiaje, Mem. iv. 41. 1829. 



Octopus pietus Blainv. Faun. Franc. Moll. 8. n. 6. from Eisso. 



Philonexis tuberculatus D'Orb. Mon. des Ceph. Acet. 87., Poidpes, 

 t. 6. 6*. t. 23. 1838, Moll. Viv. et Fos. i. 206. t. 5. f. 2—6. 

 1845. 



Hab. Mediterranean. 



6. Philonexis Alcsus. 



Body smooth above and below ; brown spotted. Arms elongate, 

 slender, free; the upper and lower pairs very long; the two 

 lateral pairs much shorter. Cups far apart. 



