92 Reviews and Records in Anatomy and Physiology. 
tissue. In one sense, then, the smooth, non-striated muscular 
fibres are only a kind ‘of infra-formation af those which are stri- 
ated—a condition of things in which the developmental changes 
persist on a low type. That this is a true version of these phe- 
a x 
i?) 
ea 
and in some insects the muscles of organic life wa the 
alimentary canal, contain both striated and non-striated fibre 
From smooth, non-striated muscle we can proceed jana 
at sbeves one step ‘farther, where this tissue is cellular in its adult 
have been arrested, as it were, at the very outset. Muscular us- 
sue of this simple kind is found in the Polypi and Acalephe, 
especially, and contraction of muscles thus composed, occurs by 
a lateral widening of the cells, the whole muscle increasing in 
breadth proportionate to ita diminution in Jength 
ith these exordial remarks, in which we have desired rather 
to notice the general relations of the subject, than to be concise 
and explicit on special points—we will now turn and take up 
somewhat in detail some particular sainsidie of this tissue, basing 
our remarks upon a set of recent investigations we have made 
under quite favorable circumstances. In this way we shall have 
occasion to refer to the other writings we have placed at the head 
of oe article. 
will commence by an examination of the highest form of 
the striated muscle, Striated muscle does not occur lower in the 
animal scaie than the Articulata ;* at least, in the other divisions of 
the Invertebrata, viz., the Ce ephalopoda, the Cephalophora, the 
Acephala, the Annelides, the Turbellaria, the Helminthes, the 
Echinodermata, the Acalephe,t and the Polypi, our own observa- 
tions agree w ith those of others who have specially examined the 
subject, that we have never been able to perceive anything of the 
* Busk (Transact. Microsc. Soc. desagits ii,) has described and figured a striated 
hielo of muscular tissue as occurrin n Anguinaria spatulata and Notamia rahe 
ave been unable, however, “after considerable search upon many B * 
ony hich were sev eral species of A/eyonella, to deback any iting like real striped 
is inti man 
lar tissue in Bins pci of Bryozoa = examined unless myostatin this observer was 
deceived bys a nage of the muscular tissue which occurs in these animals. 
in this con n, Comparative & Sms by ’ Siebold and Stannius, Translat. &c., by 
os vol i, rs 29. n 
oceedin siege of the Edinburgh Physiological Society for July 23, 1858 
(See Edin b. Month. Journal Med. Se..§ Sept., vig iig be fet Dr. Cobbold is mentioned as 
having demonstrated striated muscular fibres wrella of Medusa aurita; but 
this point needs further research, since ppb afer re in seb of the structure of 
i ibuti to the N atural Hi of ephee North Ame, the 
Sl ntributions to ory 0 ned America, in 
rs Amer. Acad. Arts and Se. 1850, N.S,, iv, pt. 1, p. 23 onset 
