364 NATURAL SCIENCE [juue 



changes be irrelevant : the hypothesis lapses. Contrariwise this fact 

 supports the view suggested above. That extrusion of a polar body 

 is a process of cell-fission is congruous with the fact that another 

 fission occurs after extrusion. And that this occurs irregularly shows 

 that the vital activities seen in cell-growlh and cell-multiplication 

 now succeed in producing further fission of the dwarfed cell and 

 now fail; the energies causing asexual multiplication are exhausted 

 and there arises the state which initiates sexual multiplication." 



A Quilted Squid 



The general zoological results of the Swedish expedition to Tierra 

 del Fuego were described in our own pages by Dr Axel Ohlin. The 

 collections made were entrusted to specialists, and the detailed con- 

 clusions are now being issued as they are completed in an octavo 

 publication entitled, " Svenska Expeditionen till Magellansliinderna." 

 Of this we have just received Vol. ii., No. 4 (pp. 49-64, pis. iv., v.), 

 which is an account of the Cephalopoda by Dr Einar Lonnberg. 

 The species collected were Octojnis fontcmianus, d'Orh.; O.patagonicus, 

 n. sp. ; Gonatus cmtarcticus, n. sp., which appears to be the southern 

 representative of the northern C fahricii ; and two almost complete 

 specimens of Onycliotndhis ingcns, E. A. Smith (1881), of which 

 only the head was known previously. Through the courtesy of Dr 

 Lonnberg we are able to present our readers with the portrait of one 

 of these specimens (Plate XL). 



The chief interest of Dr Lonnberg's paper lies in its account of 

 the integument of the last-mentioned species. Tlie surface of the 

 mantle and of the head presents a peculiar warty appearance, like a 

 cobble-stone pavement. This is due to the presence of large sub- 

 cutaneous papillae, between which tlie skin has sunk after being- 

 placed in formalin. The structure of the mantle is thus described, 

 from within outwards : A thick coat of circular or transverse 

 muscles ; a thin layer of longitudinal muscles ; a layer of connective 

 tissue of about the same thickness, and containing a large number 

 of cell-corpuscles, nuclei, and blood-vessels ; on this are situated the 

 papillae, which rise with steep sides from a broad base, and have 

 a flat upper surface ; between the papillae is delicate connective 

 tissue ; lastly, outside the papillae, comes the skin proper, consisting 

 of connective tissue, muscles running in various directions, cliro- 

 matophores, and epithelium. The papillae have a height of 1 milli- 

 metre or a little more, but vary in size and shape, some having a 

 diameter of 2*5 millimetres, others as much as 5 millimetres. Each 

 papilla is limited by thin but dense layers of elastic fibrils and fibrils 

 of connective tissue. The main mass of the papilla is a network 

 of thin, long, wavy, elastic fibrils, which enclose large irregularly 



