EBRATA AND ADDENDA. 



7 line 5 for " pterpoda" read " pteropoda." 



"13 for " brachiapoda" read " brachiopoda." 



11 " 16 for " pector" read " pecten." 



15 " 30 for "Mr. Robert" read "Mr. George Roberts;" the 

 statement is undoubtedly correct. 



22 " 16 for " slerotic" read " sclerotic." 



25 Note. Striped muscular fibre has been observed in Salpa, (Huxley.) 



28 line 8 erase the words " when withdrawn." 



28 Fig. 16 a, anterior; p, posterior; I, lateral; r, rachidian. 



30 line 27 erase " and by four in the brachiopoda." 



39 " 22 the " tubular structure" of pinna is probably occasioned by 

 the growth of a confervoid sponge between the laminse. 

 (Quekett.) 



46 " 13 erase the word " cyiindrella." 



50 " 7 for " brachiopoda" read " opistho-branches." 



52 erase lines 2023, and see p. 245. 



54 line 12 see Supplement. 



65 M. Verany and H. Miiller have shown that the Hectocotyle is 

 developed in place of the right arm of the third pair of the 

 male cephalopod, and spontaneously detached. See SUPPLE- 

 MENT. 



67 line 8 from bottom, for " dorsal" read " ventral." 



68 Tremoctopus is a sub-genus of Octopus, not of Philonex-is, 



70 line 16 add " Type, Loligo Aalensis, Schubler." 



71 " 14 for "Fidenas ? Gray" read (p R. palpebrosa." 



79 Note, for " the apocryphal genus spongarium was founded on" 



read " most of the so-called spongaria are." 



89 Sub-genus 6, Diploceras (Salter). The shell is supposed to have 

 resembled Gonioceras, and the external tube to be a simple 

 cavity formed by the approximation of the lateral angles. 

 94 line 15 (and PL III. fig. 4) for "Rhothomagensis"^?^ "Rotho- 



magensis, from Rothomagum, Rouen." 

 1 00 " 6 for " riam" read " rima." 



105 " 8 for " Strombidia, Sw." read " Rimella, Ag=" 



106 erase line 3. 



108 Admete (viridula) is a boreal form of Cancellaria, without plaits. 



252013 



