192 WHEELER 
‘51 Lerpy, J. Helminthological Contributions No. 3. Pvroc. Acad. 
Nat. Sci., Philadelphia, Vol. v. 1851. pp. 239-244. 
'82a RypeER, J. A. Observations on the Species of Planarians Parasitic 
on Limulus. American Naturalist, Vol. xvi. 1882. pp. 48-51. 
10 Figs. 
'82b RypeEr, J. A. Additional Note on the Egg-cases of Planarians 
Ectoparasitic on Limulus. American Naturalist, Vol. xvi. 1882. 
pp. 142-143. 
’61 ScHMipT, Oscar. Untersuchungen iiber Turbellarien von Corfu 
und Cephalonia, nebst Nachtragen zu friiheren Arbeiten. Zeztschr. 
jf. wiss. Zool. Bd. II. 1. Heft. 1861. pp. 1-30. PI. i-iv. 
'58 Stimpson, W. Prodromus Descriptioni Animalium Evertebratorum 
que in Expeditione ad Oceanum Pacificum Septentrionalem a 
Republica Federata missa, Johanne Rodgers duce, observavit et 
descripsit. Pars I. Turbellaria Dendrocela. Proc. Acad. WNat. 
Scz., Philadelphia, Vol. ix. 1857. -pp. 19-31. 1858. 
'73 VERRILL, A. E. Report upon the Invertebrate Animals of Vineyard 
Sound and the Adjacent Waters, with an Account of the Physical 
Characters of the Region. Report on the Condition of the Sea 
Fisheries of the South Coast of New England in 1871 and 1872, by 
Spencer F. Baird. Washington. 1873. pp. 295-778. Pl. i-xxxviii. 
"92 WaTASE, S. On the Phenomena of Sex-Differentiation. /ourn. of 
Morph., Vol. vi. No. 3. pp. 481-493. 1892. 
'91 WoopwortH, W. M. Contributions to the Morphology of the 
Turbellaria. I. On the Structure of Phagocata gracilis, Leidy. 
Bull. Mus. Comp. Zool., Harvard College, Vol. xxi. No. 1. 1891. 
pp. 1-42. Pl. i-iv. 
