462 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



According to Bate the branchial formula of Stenopus was first elucidated by Huxley in his 

 memoir on the classification of crayfishes (Proc. Zool. Soc., London, 1878). There are six pleuro- 

 brauchife; eleven arthrobrauchia?, five of which are anterior and six posterior; one podobrauchia, 

 and nix mastigobranchi*, of which the first is the only efficient appendage. 



Speuce Bate states that after careful comparisons he failed to find specific differences between 

 specimens from the Eastern and Western Hemispheres. 



ERRATA. 



As numerous errors have unavoidably occurred in this paper, I will correct the more important 

 of them. 



Page 341, line 8, for -'PI. vn " read PL x. 



Page 341, line 13, for " Lesneur" read Lesuenr. 



I 'a go 343, line 2, for " cells have spread more rapidly at a given point on the egg" read cells have increased more 

 rapidly over a given area of the egg. 



Page 343, over table for "Temperature 80 F.," read Temperature of air, 80 F. 



Page 344, lines 11, 16, 31, 32, and 47, for " Fig. 10" read Fig. 11. 



Page 344, line IX, for " largely developed " read highly developed. 



1'age 345, lino 20, for "Fig. 10" read Fig. 11. 



Page 345, line 30, for " Fig. 1 1 " read Fig. 10. 



Page 345, line 38, for " the first and second maxillipeds" read the second and third maxillipeds. 



1'age 340, line 31, for " larger than telsou" read longer than telson. 



Page 347, line 16, for "xn and Fig. 40" read xni and Fig. 39. 



Page 347, line 20, for "and 38 " read and 39. 



Page 347, lines 37 and 41, for " PI. xi" read PI. XII. 



Page 347, line 40, for " Figs. 43, 45'' read Figs. 43, 44. 



Page 347, liue 47, for ' Fig. 47" read Fig. 46. 



Page 348, line 15, omit " errinem larve." 



Page 348, for lines 32-34 read: Body nearly cylindrical; tergal surface, covered with spines. Carapace \viih 

 prominent laterally compressed rostrum and distinct cervical and branch io-cardiac grooves. Outer antenna 1 with 

 long bristle-bordered scale bent under the inner antennae toward the middle line. Second inaxillipeds with setig- 

 eroiis lamina, attached to endopodite. 



Page 348, line 46, for " a marked transverse fossa" read a marked cervical groove. 



Pa<re 348, last line, for " transverse furrow " read cervical or mandibular groove. 



Page 349, line 17, for " Fig. 40" read Fig. 39. 



Page 349, line 21, for " their inner borders which meet in the middle line" read the inner borders of the exopo- 

 dites which meet in front. 



Page 349, line 23, for " Fig. 39" read Fig. 38. 



Page 349, line 25, for " Fig. 38" read Fig. 36. 



Page 349, line 39, for " Fig. 48" read Fig. 45. 



Page 349, seventh line from bottom, for "the great chela;" read bearing the great chela-. 



Page 350, first liue, for " Fig. 48" read Fig. 47. 



Page 350, first and second lines, for "bearing a shorter proximal one below" read bearing a longer tooth and a 

 shorter proximal one below. 



Page 350, line 9, for "Fig. 41 " read Fig. 40. 



Page 350, table, tenth line from bottom, for " Length of chela" read Length of chela of same. 



Page 352, liue 10, for "hartschlilig" read hertschalig. 



Page 352, tenth line from bottom, for " Crustaces, Arachnidses" read Crustace^, Arachnides. 



APPENDIX II. 



PARASITIC FUNGUS IN THE EGG EMBRYOS OF ALPHEUS SAULCYI. 



The remarkable parasite of Alpheus satdcyi, to which allusion was made in Part First of the 

 Memoir on the development of Alpheus, is illustrated in Fig. 199, PI. LIII. Although a large num- 

 ber of egg-bearing females were examined and their eggs were sectioned, only a single female (a 

 small specimen, probably var. longicarpus, obtained from the "loggerhead sponge'' at Abaco) was 

 found to be infested with this singular parasite. We may therefore regard it as very rare under 

 these conditions. 



