Archive image from page 514 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatic cells of lulus fabulosus. same shape as the nucleus. The sperma- tozoa in I. fabulosus do not, therefore, con- sist in one short cone, but rather in two such formations (fig. 378. D, E, F), which are turned towards each other with their broad surfaces partially touching. One of these is not unfrequently distinguished from the other by a more considerable size- In a developed state, when the original cell membrane, in which the cone was formerly imb
Archive image from page 514 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana0401todd Year: 1847 Spermatic cells of lulus fabulosus. same shape as the nucleus. The sperma- tozoa in I. fabulosus do not, therefore, con- sist in one short cone, but rather in two such formations (fig. 378. D, E, F), which are turned towards each other with their broad surfaces partially touching. One of these is not unfrequently distinguished from the other by a more considerable size- In a developed state, when the original cell membrane, in which the cone was formerly imbedded, has disappeared, the two parts sometimes separate, each having a perfect resemblance to the spermatozoa of I. terrestris. V. Sicbold, to whom we are indebted for the first accurate statement respecting the Chilo- pods, was not acquainted with the developed forms of these parts in I. fabulosus. He de- scribes as such the stages of developement of the spermatic cells illustrated by us in fig. 378. AtoE, comparing them with the shape of snuff-boxes, in which the lower surface is much thickened, whilst the upper surface contains in the centre a roundish nucleus. The spermatozoa of the Chilognatha f are filiform and of a very considerable length and thickness ; e. g. in Geophilus, where they mea- sure \\'''. Towards one end they gradually become finer, and usually rather undulating or spiral, particularly at the anterior thick part. In Geophilus these fibres are rolled up separately into one ring-like curl ; in Scolopendra, on the other hand, they are straight, and united in small numbers into string-like bundles. Nothing certain is as yet known respecting the developement of these fibres; but, with V. Sicbold, we think it very probable that they originate from the larger cells (measuring in Geophilus -gL'', in Lithobius '' — TV')» which co'- tain a single, double, or treble nucleus (of .ji'' --Jo'') witn a nucleolus, and Miiller's Ardriv. 1841, S. 13. f See Stein. Mull
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