462 MEMOIRS OF THE NATIUXAL ACADEMY OF SCIENCES. 



According to Bate the braucbial formula of Stenopus was first elucidated by Huxley iu his 

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

 branchiie; eleven arthrobranchiae, fiv'e of which are anterior and six posterior; one podobranchia, 

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



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

 specimens from the Eastern and Western Hemispheres. 



EREATA. 



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

 of them. 



Page 341, liue 8, for -'PI. vii " read PI. x. 



Page 341, liue 13, for '• Lcsnenr" read Lesuenr. 



Page 343, line 2, for " cells have spread more rapidly at a given point ou the egg" read cells have increased more 

 rapidly over a given area of the egg. 



Page 343, over table for " Tennperature 80° F.," read Teuiperatuve of air, 80° F. 



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



Page 344, line 18, for " largely developed " read highly developed. 



Page 345, lino 20, for "Fig. 10" read Fig. 11. 



Page 345, line 30, for "Fig. 11 " read Fig. 10. 



P.age 345, line 38, for "the first and second niaxillipeds" read the second and third maxillipeds. 



Page 346, line 31, for " larger than telsou " read longer than telson. 



Page 347, line 16, for " xii and Fig. 4U " read xiii and Fig. 3a. 



Page 347, line 29, 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, line 47, for " Fig. 47 " read Fig. 46. 



Page 348, liue 15, ohiit "erriuem larve." 



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

 promiueiit laterally compressed rostrum and distinct cervical and branchio-cardiac grooves. Outer antennse with 

 long bristle-bonlered scale bent under the inner antennse toward the middle liue. Second maxillipeds with setjg- 

 erous lamina, attached to endopodite. 



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



Pairo 348, last line, for " transverse furrow" read cervical or mandibular groove. 



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



Pa^e 349, line 21, for " their inner borders which meet iu 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 chel*. 



Page 3.50, 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 3.50, line 9, for "Fig. 41 " read Fig. 40. 

 « Page 3.50, table, tenth line from bottom, for " Length of chela" read Length of chela of same. 



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



Page 352, tenth liue from bottom, for "Crustacos, Arachnidses" read Crustac^s, Arachnides. 



APPENDIX II. 



PARASITIC FUNGUS IN THE EGG EMBRYOS OF ALPHEUS SAUICYI. 



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

 Memoir on the development of Alpheus, is illustrated in Fig. 199, PL 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. longicarpiis, 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. 



