) )) 



210 A. S. Packard, Jr. on certain Entomological Speculations. 



nate forms as Euphrosyne, Cryptonota, Polynoe, and some twenty 

 additional genera closely allied, and which are among the most typical 

 of their class, though all are elliptical, flat, and scarcely twice as long 

 as broad? Would he exclude from his "System," the flat-worms, 

 Leptoplana, Typholepta, Polyscelis, Mesnstomum, Planocera, Thy- 

 sanozoon, and a host of other flattened, cylindrical, " unworm-like" 

 forms, most strangely unlike our author's typical attenuated theoretical 

 " worm ?" 



Surely, to bridge over the immense gaps between an adult Glordius 

 and an elliptical, flattened, worm-like Leptoplana, demands " ' that 

 highest faith'" of which Mr. Walsh quite apparently " 'falls short 



In the writings of Leuckart, Siebold, Quatrefages, Milne Edwards, 

 Desor, Grirard, Sars and Grrube, who have ably expounded the laws of 

 the development and classification of Aunelids, may our author, if he 

 be " 'content trustfully to follow the evidence, whithersoever it leads," 

 learn that even the Hair-worm (Gfordius) " ' harmonizes'" in structure 

 with the Leptoplana and other flattened elliptical " unworm-like" 

 aunelids. 



Mr. Walsh, for the same reason, on page 233, contends that the 

 larva of the Katydid (Platyphyllum concavum Harr.) cannot be worm- 

 like, because it is " only about one-half longer than wide," and is not 

 " curled up in its egg." This statement may be offset by the observa- 

 tion of Mr. Andrew Murray,* that the young Blatta is " vermiform." 



In alluding to the erroneous statement that the larval and pupal 

 states of some Orthoptera are passed within the egg before hatching, 

 Mr. Walsh is probably unaware that the statement of Mr. Murray, 

 that the Phyllium passes the larval and pupal stages in the egg, has 

 by Mr. Murray himself, in the article above referred to (Linnaean Pro- 

 ceedings), been very candidly stated to have been the result of imperfect 

 observations; and as it proved, are quite erroneous. Mr. Murray 

 distinctly avows, however, his belief that the so-called larva and pupa 

 of many Orthoptera and Hemiptera, are but adult forms, as was also 

 maintained by Prof. R. Owen in his lecture on the Invertebrate 

 Animals, in 1843. 



We are glad to agree with Mr. Walsh, in maintaining that what 

 geuerally are considered as larval and pupal forms of Hemiptera and 

 Orthoptera, are really such, though it is well-known that immature 

 Hemiptera have been found sexually united, as has been observed in 

 regard to some Orthoptera. The statement of Prof. Owen, that the 

 " apodal," " acephalous" embryo of Blatta, corresponds to the larva 



* Proceedings Liuneean Society, vol. vii, 1862. 



